Best Non-Toxic Dinnerware: 4 Sets, and Why Your Mug Has a Stricter Lead Limit Than Your Plate

Written by Lara Yehia — Lara researches home and kitchen products for Cupindy. She uses these items daily in her own kitchen and collects real-use feedback from other households before anything gets recommended here.

How we researched this: we did not lab-test any dinnerware, and we are not materials scientists. This guide is built from the U.S. Food and Drug Administration’s published compliance policy on ceramic foodware, FDA’s consumer guidance on lead-glazed pottery and melamine tableware, two U.S. Consumer Product Safety Commission recall notices, the text of California Assembly Bill 1200, and manufacturers’ own published statements and care instructions.

Last reviewed: September 2026 — Reviewed for: current FDA action levels, active recalls, and product availability.

The short answer

The safest everyday dinnerware is undecorated, fully vitrified material — plain porcelain or tempered glass. Both are non-porous, neither has surface decoration to raise questions about, and both come from the kind of large-factory production that FDA describes as far less likely to have lead problems than handmade or imported traditional pottery.

Three things below are not in any other guide: FDA does not have one lead limit for dishes, it has five, and your plate gets the loosest one while your mug gets the strictest. California’s chemical disclosure law does not cover plates. And the reason your plate comes out of the microwave hotter than the food has a measurable, checkable cause.

Editorial note. This is a buying guide for everyday plates, bowls and mugs. It is not medical advice and it is not a test report. Where we describe a product we quote what the manufacturer publishes or what a regulator has formally recorded. We do not repeat home swab-kit results from third parties, and we do not name brands as unsafe on the strength of them.

Freshness. Recalls and regulations change. Everything below carries a date — check the FDA and CPSC sources at the end before acting on anything time-sensitive.

The four sets, at a glance

Disclosure: Cupindy is a participant in the Amazon Services LLC Associates Program. If you buy through the links on this page, we may earn a commission at no extra cost to you.

Full reasoning for each is further down. Every one of them has a drawback and we name it there.

Corelle Vitrelle 18-Piece
Tempered glass — small cupboards, daily use
Amazon
Amazon Basics Porcelain 18-Piece
Porcelain — the plainest, strictest choice
Amazon
AmorArc 18-Piece Stoneware
Stoneware — the handmade look
Amazon
Stansport 24-Piece Enamel
Enamel on steel — children, outdoors, includes mugs
Amazon

What the lead rules actually say

The relevant document is FDA’s Compliance Policy Guide Section 545.450, Pottery (Ceramics); Import and Domestic — Lead Contamination. It sets the levels at which FDA considers ceramic foodware to be in violation, in micrograms of lead per millilitre of leaching solution.

Category How it is tested Action level
Flatware — your dinner plate Average of 6 units 3.0 µg/mL
Small hollowware, other than cups and mugs Any one of 6 units 2.0 µg/mL
Large hollowware, other than pitchers Any one of 6 units 1.0 µg/mL
Cups and mugs Any one of 6 units 0.5 µg/mL
Pitchers Any one of 6 units 0.5 µg/mL

Source: FDA Compliance Policy Guide Sec. 545.450.

Two things there matter more than the numbers.

“Flatware” in this document does not mean forks and spoons. It is a shape category. FDA defines it as ceramic articles “which have an internal depth as measured from the lowest point to the horizontal plane passing through the upper rim, that does not exceed 25 mm.”

How FDA measures a plate

horizontal plane through the upper rim

↕  internal depth

lowest point

Under 25 mm deep → flatware → limit 3.0 µg/mL, averaged across six pieces
25 mm or deeper → hollowware → limit 2.0 or 1.0 µg/mL, and any single failing piece fails the lot

A dinner plate is under 25 mm deep. So your dinner plate is flatware, and it is judged against the loosest number in the document. If you are looking for the guide to actual forks and spoons, that is our separate piece on non-toxic flatware.

The test method changes between rows, and that matters as much as the limit. Flatware is judged on the average of six pieces, so one high plate can be pulled down by five low ones. Every other category is judged on any one of six — a single failing piece is a failing result. Put the two together and a mug is held to a limit six times lower than a plate, on a test that is far harder to pass.

Hollowware is split by capacity: under 1.1 litres is small, 1.1 litres or more is large. A cereal bowl is small hollowware. A serving bowl is usually large.

One more clause worth knowing. Plates made purely as ornaments — commemorative, souvenir, highly decorated display plates — are exempt from these levels, provided they comply with the separate labelling rule at 21 CFR 109.16(b). That is why a decorative plate can legally exist with lead in its glaze. It was never meant to hold food. We come back to this below.

The disclosure gap nobody mentions

California’s Assembly Bill 1200 is the reason you can now look up a cookware brand and read a list of the chemicals it intentionally adds. It is a genuinely useful law and we lean on it constantly when writing about pots and pans.

It does not clearly cover your plates.

“Cookware” means durable houseware items that are used in homes and restaurants to prepare, dispense, or store food, foodstuffs, or beverages. “Cookware” includes pots, pans, skillets, grills, baking sheets, baking molds, trays, bowls, and cooking utensils.

Read the list. Bowls are named. Trays are named. Plates are not. Cups and mugs are not. And the activities named are preparing, dispensing and storing — not eating from.

The practical consequence: searching a dinnerware brand plus “AB 1200” will usually return their cookware filing, or nothing at all. That is not a brand hiding something. It is a law that stops short of the dinner table. Any guide telling you to check a brand’s AB 1200 disclosure for dinnerware is sending you to a dead end.

What you can do instead is narrower but real: look for a brand that publishes, in its own words, that it tests for lead and cadmium at a third-party laboratory. Some do. Most say only “lead free” on the listing and publish nothing behind it. That distinction is one of the things we weigh in the picks below.

Why your plate comes out of the microwave hotter than the food

A folded tea towel used to lift a hot dinner plate out of a microwave
Two different things heat a plate in a microwave, and only one of them is about the material.

This is the most-asked question about everyday dishes and the least-answered, so here is the mechanism.

A microwave heats water. Dry, fully vitrified ceramic contains almost none, which is why a good porcelain plate can come out barely warm. Porous ceramic is different: it has absorbed moisture into the body of the piece over its life, and that trapped water heats exactly like the water in your food.

IKEA explains it the same way in its own customer support material, describing “water molecules that for various reasons are stuck inside the porcelain” and noting that ceramics and porcelain “sometimes contain small amounts of water or minerals that cause them to become hot.”

Porosity is measured as water absorption, and it is what separates the ceramic families:

Water absorption, and what it does in a microwave

Earthenware — about 5% or more

Gets genuinely hot. Traditional terracotta and much rustic pottery.

Stoneware — roughly 1–2%

Warms noticeably. This is what most “non-toxic dinnerware” brands actually sell.

Porcelain and tempered glass — effectively none

Does not heat itself. Corelle describes its glass as “ultra-hygienic, non-porous.”

The second mechanism is the one that catches people out. Even a completely non-absorbent plate gets hot if the food on it is hot, by plain conduction. Thin, lightweight dishes pass that heat to your fingers faster than thick ones. So the honest answer to “which plates don’t get hot” is: non-porous ones do not heat themselves, but nothing protects you from a plate that has sat under hot food for three minutes. Shorten the time, not just the material.

If your question is specifically about porcelain in the microwave, we have a dedicated piece on whether porcelain is microwave safe. For the porous end of the scale, see cooking earthenware pots.

Why “plant-based” is not the same as “fine with hot food”

On 19 May 2021 the U.S. Consumer Product Safety Commission announced a recall of IKEA HEROISK and TALRIKA bowls, plates and mugs. The hazard, in CPSC’s words: the items “can become brittle and break, causing hot food or liquid to leak out, posing a burn hazard.” Roughly 148,000 units were recalled in the United States and about 11,400 in Canada, following 123 breakage reports globally and four injuries, two requiring medical attention. Consumers were told to stop using them and return them for a full refund.

The material was PLA — polylactic acid, the plant-based bioplastic that most sustainability-minded guides recommend without hesitation. We are not telling you bioplastic is dangerous; this was one product line and it was withdrawn. We are telling you that “made from renewable sources” is a statement about where a material comes from, not about how it behaves when you put hot soup in it.

Gold rims, metallic trim and decoration

Close-up comparing a plate with a thin gold metallic rim against a plate with a plain undecorated rim
Applied metallic banding sits on top of the glaze, not under it. That is why it wears — and why it sparks.

Three separate worries get tangled together here. They have three different answers.

Metallic rims and the microwave: a genuine no. Gold, silver and platinum banding is real metal. IKEA’s guidance is blunt — dishes with metal rims “should never be used as metal reflects microwaves and can cause sparks.” This is a fire and damage question, not a health one, and it applies whatever the plate underneath is made of.

Metallic rims and the dishwasher: a qualified no. Applied metallic decoration sits on top of the glaze. Detergent and repeated hot cycles wear it. If you have inherited a gold-rimmed set you want to keep, hand washing is the difference between keeping the band and watching it go patchy.

Decoration and lead: it depends on the colour and the era. FDA’s consumer guidance on lead-glazed pottery flags ware that is “brightly decorated in orange, red, or yellow color, as lead is often used with these pigments.” That is a warning about certain pigments in certain kinds of pottery — chiefly handmade and imported traditional ware — not a claim that every patterned plate is a problem. FDA is equally clear that commercially manufactured factory pottery “is much less likely to have problems related to lead.”

Which leaves you with a ranking rather than a rule. An undecorated white plate is the most conservative choice available, because there is no applied decoration to ask questions about at all. A modern, factory-made patterned plate from a brand that publishes its testing is a reasonable second. An unmarked, brightly hand-painted piece of unknown origin is the one to keep for display.

Vintage and inherited dinnerware

Older patterned dinner plates stacked with the top plate turned over to show its unglazed foot ring
Turn the plate over. Ware made for decoration only is sometimes stamped as such.

This is where most real anxiety lives, and it deserves a straight answer rather than reassurance.

Lead was used in ceramic decorating for a long time, and it was legal. Corelle addressed this publicly in May 2022, and its statement is the clearest thing any manufacturer has said on the subject. The company acknowledged that “before 2000, and before tighter lead content safety regulations, a small amount of lead was an ingredient in the decorating process of many household products,” said it was “further investigating pre-2000 Corelle products to confirm they comply with today’s safety standards — and whether it’s okay to use pre-2000 product as everyday dinnerware,” and invited customers to enjoy vintage pieces “either decoratively or at your table every day.” On current production it stated: “We routinely test Corelle products for lead and cadmium contents at internationally recognized, third-party testing laboratories. This testing confirms that our products comply with applicable federal and state safety regulations.”

We quote that at length because it is rare: a manufacturer describing an industry-wide historical practice in its own words. It applies to household products broadly, not to one brand.

What FDA advises you to be wary of, in its own list: handmade pottery with a crude appearance, antique pieces, damaged or worn items, and anything bought from a flea market or a street vendor. It also notes that ware manufactured for decoration only “may have a warning stamped onto the clay bottom such as ‘Not for Food Use—May Poison Food.’”

“No amount of washing, boiling, or other process can remove lead from pottery.”
U.S. Food and Drug Administration

On home test kits: FDA notes they can be bought at hardware stores and online. What it does not say is that a negative swab proves a dish is safe. These kits detect lead at the surface under the conditions of the swab; they are not the acid-leaching test the action levels above are based on. Treat a positive result as a reason to stop using the piece for food, and a negative result as weak reassurance rather than a clearance.

The workable rule for an inherited set: if it is undamaged, factory-made, and you know roughly when and where it came from, everyday use is a defensible choice. If it is chipped, crazed, worn through the pattern, hand-painted by an unknown maker, or simply a mystery, make it a display piece. That costs you nothing and removes the question.

The recall that explains this entire article

On 22 November 2023, CPSC announced the recall of PandaEar stainless steel toddler cups. The reason, quoted from the notice: “The bottom exterior of the recalled stainless-steel cups contains an accessible solder bead with levels of lead that exceed the federal lead content ban.” About 1,600 cups were affected.

Read that again. The product was stainless steel. The stainless steel was not the problem. The problem was a bead of solder on the outside of the base — a joining material, in a place a small child’s mouth can reach.

The material named on the box is not necessarily the material touching your food, and it is almost never the only material in the product.

A “glass” dinner set can ship with stoneware mugs. A “stainless steel” set can be joined with solder. An “enamel” plate is steel with a glass coating, and its rim may be bare metal.

So evaluate a set piece by piece. And remember from the table at the top: the mug — the piece most likely to be made differently from the rest of the set, and the piece most often bought separately as an afterthought — is the one FDA holds to the strictest limit of all.

One related point, because these two get conflated constantly. FDA issued a warning in August 2025, updated 3 December 2025, about certain imported cookware that may leach significant levels of lead — aluminium, brass, and the aluminium alloys known as Hindalium or Indalium, largely from India and Pakistan with some from China. That warning is about cookware, for cooking and food storage. It is not a warning about dinnerware, and you will see it cited as though it were.

Materials, ranked by how confident we are

Four dinnerware materials side by side: tempered glass, white porcelain, speckled stoneware and enamelled steel
Left to right: tempered glass, vitrified porcelain, stoneware, enamel on steel.

Buy without hesitating

Tempered glass. Non-porous, nothing applied to the surface on the plain versions, and it does not develop the crazing that turns an old glaze into a question. Also the lightest thing in the cupboard per plate. The trade-off is thermal shock, covered below.

Vitrified porcelain, undecorated. Fired high enough to be effectively non-absorbent, so it behaves well in a microwave, and with no applied decoration there is nothing on the surface to ask about. Chips at the rim if you stack it hard.

Good, with a caveat you should know

Stoneware. What most brands marketed as non-toxic dinnerware actually sell, and a perfectly reasonable material. Two caveats. It sits at roughly 1–2% water absorption, so it is the category that warms in the microwave. And “lead free” on a stoneware listing is usually the seller’s own statement with no test report behind it — not false, just unverified, and worth knowing the difference.

Enamel on steel. Glass fused to metal, which is an inert food surface and effectively unbreakable in normal use. Two caveats: rims are often left as bare steel, and chips expose metal that will then rust; and it cannot go in a microwave at all.

Bone china. Vitrified, thin, strong for its weight. It contains bone ash, which is a genuine consideration for vegetarian and some religious households and is almost never mentioned in guides that recommend it.

Fine for what it is — but read the limits

Melamine. FDA’s position is more specific than either side of the internet argument. It says plainly that “foods and drinks may be served on plastic tableware,” and its migration testing found that under actual use conditions — cold acidic juice held for 15 minutes — migration would be less than 10 parts per billion, which FDA describes as 250 times lower than its acceptable level of 2,500 parts per billion for foods other than infant formula.

The limits are equally specific. FDA measured migration “under exaggerated conditions” by holding acidic food at 160°F for two hours, and identifies 160°F or higher as where migration rises significantly. And it states directly: “Foods and drinks should not be heated on melamine-based dinnerware in microwave ovens.”

So: melamine is fine to eat off, and should not be used to reheat. It is a serving material, not a cooking one. For picnics and children’s meals that is often exactly what you want. Our guide to plastic grades in food storage covers the numbering system if you want to go further.

Wheat straw composite. Usually wheat-straw fibre bound in polypropylene, so it is a plastic composite rather than a plant product, whatever the marketing suggests. Judge it as you would any polypropylene item and check the manufacturer’s heat guidance rather than the packaging adjectives.

Wood. Pleasant to eat from, genuinely non-reactive, and high maintenance. Not dishwasher safe in any meaningful sense, needs re-oiling, and should not be left wet. We covered the trade-offs in our piece on wooden kitchenware.

We would not use these for daily meals

Unmarked handmade or imported glazed pottery of unknown origin. Anything stamped as decorative or for display only. Chipped, crazed or visibly worn glaze on older ware. Not because any specific piece is proven to be a problem, but because in each case you have no way to find out, and the alternative costs nothing.

What we would buy

Four sets, chosen to cover four different households rather than to rank one above the others. Each gets a drawback named, because every one of them has one.

Best for small cupboards and daily use

Corelle Vitrelle 18-Piece Service for 6

Six 10¼-inch dinner plates, six 6¾-inch appetiser plates, six 18-ounce soup and cereal bowls. Triple-layer glass, described on the listing as crafted in Corning, New York. Corelle calls it ultra-hygienic and non-porous.

It stacks into roughly half the cupboard space of a ceramic set the same size, and the weight difference is what people notice first — it matters if you are carrying six plates in one hand or loading a dishwasher every day.

The drawback, from Corelle’s published care instructions for its Vitrelle dinnerware: “DO NOT add liquid to a hot item, place a hot item on a wet surface, or handle with a wet or cold cloth. These sudden temperature changes may cause the item to break or shatter.” This listing separately rules out the stovetop, the broiler, and a microwave browning element. Thermal shock is the real failure mode of the set everyone calls unbreakable.

On the pattern: the linked version has a banded rim design. It is not metallic, so the microwave objection does not apply, and Corelle publishes that it tests current production for lead and cadmium at third-party laboratories. If you want the strictest version of this recommendation, the identical set exists in plain white with nothing on the surface at all — buy that instead when it is in stock.

See it on Amazon

The strictest, plainest choice

Amazon Basics Porcelain 18-Piece, White

Dinner plates, dessert plates and bowls for six, in plain white porcelain with no pattern, no rim band and no metallic trim. Microwave and dishwasher safe.

This is what we would point at if someone asked for the most conservative choice available without spending real money. Vitrified porcelain is effectively non-absorbent, so it behaves best of the four in a microwave, and an undecorated surface removes every question the decoration section above raises. It is also the reference point the other three are measured against.

The drawback: porcelain chips at the rim, and unlike glass a chip exposes the unglazed body underneath — a porous surface in exactly the spot your mouth touches. Retire a chipped porcelain plate promptly rather than keeping it in rotation.
See it on Amazon

If you want the handmade look

AmorArc 18-Piece Stoneware, Reactive Glaze

Six 10.5-inch dinner plates, six 8.5-inch salad plates, six 24-ounce bowls. Reactive glaze, so every piece varies. The brand states the set is lead-free and cadmium-free, and fired at 2,340°F for 13 hours.

We include it because it is what most people picture when they think of non-toxic dinnerware, and because the visual difference from the two sets above is substantial. It is the best-supported set in its style by a wide margin.

Two drawbacks. First, it is stoneware, so it sits in the 1–2% absorption band — this is the set here most likely to come out of the microwave warm. Second, and this applies to the whole category rather than this brand: the lead-free claim is the seller’s own statement on the listing, with no third-party test report published behind it. That is not evidence of a problem. It is a difference in what you can verify.

Buyers also report that handmade pieces do not stack perfectly evenly and that colour varies between orders, which is inherent to a reactive glaze rather than a defect.

See it on Amazon

Children, outdoors — and it includes the mugs

Stansport Deluxe 24-Piece Enamel Tableware Set

Four 10.5-inch plates, four 6-inch bowls, four 12-ounce mugs and four flatware sets. Steel with a double-coated glazed enamel finish. Marketed for camping, and equally sensible for a household with young children, a balcony, or anyone who has swept up one plate too many.

It is here partly for a reason the marketing does not mention: it is the only set on this page that includes mugs. Most dinnerware sets stop at plates and bowls, so people buy mugs separately, later, with less thought — and as the table at the top shows, cups and mugs are the category FDA holds to the strictest lead limit of all. A set that includes them is a set you do not have to solve twice.

Two drawbacks, both honest. It cannot go in a microwave, which in an article largely about microwave behaviour is not a small thing. And the listing describes the finish as a double-coated coloured glazed enamel while the material field simply reads alloy steel; it makes no statement about lead or cadmium testing either way. We are not suggesting there is a problem — we are saying that on a coloured glaze a published statement is what you would want to see, and here there is not one. If that matters to you, one of the first three sets is the better answer. The listing also describes the pieces as having stainless steel edges, which means the rim itself is not enamelled — and rims are where enamel chipping starts.
See it on Amazon

Making a set last

  • Never put a hot dish onto a wet or cold surface, and never pour cold liquid into a hot one. Thermal shock breaks more glass dinnerware than dropping does.
  • Stack with something between plates — a paper towel or a felt divider. Almost all rim chips happen in the cupboard, not at the table.
  • Retire chipped or crazed pieces from food use. A crack in a glaze is a place that cannot be cleaned properly, whatever the piece is made of.
  • Hand wash anything with a metallic rim, and keep it out of the microwave entirely.
  • Grey metal marks from cutlery are cosmetic, not damage. They come off with a mild abrasive cream cleaner.
  • Shorten microwave times and stir instead. Half the “hot plate” problem is heating time, not material.

Questions people ask

What is the safest dinnerware material?

Undecorated, fully vitrified material — plain porcelain or tempered glass. Both are non-porous, neither has applied surface decoration to raise questions about, and both are made by large factories that FDA describes as much less likely to have lead problems than handmade or imported traditional pottery.

Which plates don’t get hot in the microwave?

Non-porous ones — porcelain and tempered glass — because there is no absorbed water inside them to heat. Earthenware is the worst offender at around 5% or more water absorption, with stoneware at 1–2% in between. But no plate is protected from conducting heat out of hot food, so shorter heating times matter as much as the material.

Can you microwave plates with gold trim?

No. Metallic decoration reflects microwaves and can spark. This applies to gold, silver and platinum banding regardless of what the plate underneath is made of. Those plates should also be hand washed, because dishwasher cycles wear applied metallic decoration away.

Is melamine safe to eat off?

FDA says foods and drinks may be served on plastic tableware, and its testing found migration under real use conditions at less than 10 parts per billion against an acceptable level of 2,500 parts per billion. But FDA states directly that food and drink should not be heated on melamine dinnerware in a microwave, and identifies 160°F as the point where migration rises significantly. Serve on it; do not reheat on it.

Are wooden plates safe to eat on?

Yes, with upkeep. Wood is non-reactive and does not leach, but it is not dishwasher safe in practice, needs periodic oiling, and must not be left wet. The safety question about wood is really a hygiene-and-maintenance question.

Are wheat straw plates better than plastic?

They usually are plastic. Most wheat straw dinnerware is wheat fibre bound in polypropylene. Treat it as a polypropylene item and follow the manufacturer’s heat guidance rather than the packaging.

Do vintage dishes contain lead?

Some do. Lead was legal in ceramic decorating for decades, and Corelle’s own 2022 statement acknowledged that before 2000 a small amount of lead was an ingredient in the decorating process of many household products. FDA advises particular caution with handmade, antique, damaged or worn ware and anything from a flea market or street vendor, and states that no amount of washing or boiling removes lead from pottery. Undamaged factory-made ware of known origin is a defensible everyday choice; anything unknown or damaged is better kept for display.

Is stainless steel lead-free?

The steel itself is not the usual concern — the joining materials can be. In November 2023 CPSC recalled PandaEar stainless steel toddler cups because an accessible solder bead on the exterior base exceeded the federal lead content ban. That is the general lesson: check what a piece is joined and finished with, not only what the body is made of. For grade questions, our guide to stainless steel grades explains 18/8 and 18/10.

What is the difference between porcelain, stoneware and bone china?

Firing temperature, and what that does to porosity. Porcelain is fired highest and is effectively non-absorbent. Stoneware is fired lower and holds 1–2% water. Bone china is porcelain with bone ash added, which makes it thinner and stronger for its weight — worth knowing if bone content matters to your household. In practice porcelain and bone china behave best in a microwave; stoneware warms.

The four sets again

Corelle Vitrelle 18-Piece
Tempered glass — lightest, smallest footprint
Amazon
Amazon Basics Porcelain 18-Piece
Plain, undecorated, best in a microwave
Amazon
AmorArc 18-Piece Stoneware
Handmade look — the one that warms
Amazon
Stansport 24-Piece Enamel
Unbreakable, includes mugs, no microwave
Amazon

Sources reviewed

  • U.S. Food and Drug Administration — Compliance Policy Guide Sec. 545.450, Pottery (Ceramics); Import and Domestic — Lead Contamination
  • U.S. Food and Drug Administration — Questions and Answers on Lead-Glazed Traditional Pottery
  • U.S. Food and Drug Administration — Melamine in Tableware: Questions and Answers
  • U.S. Food and Drug Administration — FDA Issues Warning About Imported Cookware That May Leach Lead, August 2025, updated 3 December 2025
  • U.S. Consumer Product Safety Commission — IKEA Recalls Bowls, Plates, and Mugs Due to Burn Hazard, 19 May 2021
  • U.S. Consumer Product Safety Commission — PandaEar Recalls Stainless Steel Children’s Cups Due to Violation of Federal Lead Content Ban, Recall 24-716, 22 November 2023
  • California Assembly Bill 1200 (2021), Health and Safety Code definition of “cookware”
  • Corelle Brands — company statement on vintage dishware and lead, May 2022, as reported by KPRC
  • IKEA customer support — guidance on why dishes heat in the microwave and on metal-rimmed dishware
  • Ceramic classification by water absorption — standard industry ranges for earthenware, stoneware and porcelain