Polymer Clay Terms – Glossary and Definitions

Polymer Clay Dictionary

Remember when there was a glossary in the back of your textbook? Here’s your polymer clay glossary! Every hobby has its special words and jargon with unique definitions that are unfamiliar to outsiders. Newbies and beginners struggle with new tools, skills, and materials, so it’s even more difficult when there’s a whole new vocabulary to learn as well. Here’s a list of polymer clay terms (and their definitions) that we commonly use when working with the medium of polymer clay.

Acrylic Rod

This is like a rolling pin for polymer clay. We use acrylic because it doesn’t react with the clay and doesn’t absorb the clay’s oils the way that wood can do.

Acrylic rods are used like rolling pins for polymer clay
Acrylic rods are used like rolling pins for flattening polymer clay.


A process where you add a dark layer of paint (or similar) over the surface of an item and then wipe most of it off. This leaves darkness in the crevices, making the item look old, worn, or antique.


A “skeleton” or support that a sculpture is built over. It can be made from wire, compressed aluminum foil (known as a foil core), or even cardboard. An armature doesn’t prevent breakage. Instead, it gives the item support so that it won’t droop under its own weight.

Bake and Bond

Sculpey Bake and Bond is a thick liquid clay that is used as an adhesive. It must be baked to cure, as it’s made from the same “stuff” as polymer clay. It’s been rebranded as Sculpey Oven Bake Clay Adhesive, but you’ll still hear many people calling it Bake and Bond.

Bake and Bond Sculpey Oven Bake Clay Adhesive


There’s some disagreement about what we call this process of making polymer clay hard. There are people who are offended when we say that we bake polymer clay. It sounds amateurish to their ears. Here’s the scoop. Polymer clay gets hard by a process of curing. When you put it in the oven, you’re curing it. Cure is always a correct term for this process. But we cure polymer clay by baking it in an oven. Anything that is heated in an oven is baked. You’ve heard of baked-on coatings, right? Sun-baked earth. Yes, baking is also a correct term.  We cure our polymer by baking it!

However, we don’t say that we cook polymer clay. According to the dictionary, cooking is a term applied to food. You cook your dinner. And as a joke, we might “cook the books”. But we never cook our polymer clay. It is not food! If you struggle with baking, this tutorial will help.

Bead Pins

Small, stiff, sharp, pointed wires are used to pierce holes into unbaked beads. The beads are baked on the pins. This serves to make a hole without distortion. The wire can later be used as a handle if you need to varnish the beads. Afterward, the beads are removed from the pins and the holes drilled larger if necessary. The bead pins can be reused indefinitely. Read more about bead pins here.


As you would expect, bubbles are air that was trapped between layers of clay as you condition your clay or construct your piece. The trapped air expands during baking and causes a bubble or bump. Sometimes it causes cracks in your finished piece. This is not the same thing as plaques.


To burnish is to make smooth by rubbing. You can use a piece of patty paper, baking paper, or a deli sheet to cover the surface and then rub with something smooth to burnish the clay’s surface flat. This technique is often used to smooth seams or meld pieces of clay together. You can burnish the clay directly, by using some paper, or with a finger or with a brush. Each approach gives a different effect.


A log of polymer clay that has an image or design running the entire length. Similar to slice-and-bake cookies, all slices of a cane will reveal the same image. When you “reduce a cane”, you make this log smaller, so that the resulting smaller slices have a smaller version of the image. In glassworking, these canes are called murrine. Learn more about polymer clay canes here.

Flower canes can be made in any color.
Flower Canes made from polymer clay.

Clay Softener

Sculpey Clay Softener and Cernit Magic Mix are bottles of plasticizer that you can use to make crumbly and hard blocks of polymer clay more workable. Years ago, Sculpey’s Clay Softener was called “Clay Diluent” (DILL-you-unt) and you might still see that term being used.


When polymer clay sits around for a while, it sort of gels up and becomes stiffer and more likely to crumble when worked. You always have to condition or massage your polymer clay to make it more workable. While you can use your hands or an acrylic roller to do this, most artists use a pasta machine. You’ll know your clay is conditioned if it can be worked well without cracking or crumbling and seams can be invisibly blended. Learn more about conditioning in this article.

Deli Sheets

This can refer to baking paper, parchment paper, deli paper, deli plastic, patty paper, or waxed paper. While there are distinct products, the names tend to differ by country. You can learn more about this wildly confusing topic in my article on these papers here.

Embossing Powder

This colored powder melts in the heat. Normally used in papercrafting to create a raised design, we also use it in polymer clay as an inclusion. If you mix embossing powder into translucent polymer clay and bake, you’ll see a stone-like effect. It’s usually too soft to be used on the surface of polymer clay, even though it will melt in the heat. It’s better to use cold enamels for that. (see below)

Enamel (or Cold Enamel)

Cold enamels are colored powders that melt in the heat to make a hard, shiny, colored surface. You can apply them to the surface of polymer clay in designs and then bake. It creates an effect similar to glass enamels. A popular brand name is EF Color.


This tool allows you to squirt polymer clay through a shaped disk, giving you “snakes” of clay that can be round, square, or any number of complex shapes. Depending on the way the colors are loaded into the extruder and the shape of the disk, there’s a huge variety of techniques that can be done with an extruder. Read my review of the community’s favorite extruder, the Czextruder (Affiliate Link – learn more here).

In this Czextruder review, see how this extruder compares to others for polymer clay.
Polymer clay extruders. Top is the Czextruder, the green one is by Makins Clay, and the bottom one is the Walnut Hollow. The bottom one is also sold with the Fimo label.

Foil Core

A compressed shape made from aluminum foil that is used at the center of large beads or sculptures. A foil core bulks out an item, greatly reducing the amount of clay that is needed. It also makes an item more lightweight.

Gilding Cream or Paste

A cream or wax that contains mica (so it appears pearlescent or metallic) that is used to highlight textured areas of an item.

gilding pastes are used to give highlights to texture
A variety of gilding pastes, used to give highlights to texture on polymer clay creations.

Glaze, sealer, varnish

While polymer clay does not need to be sealed and does not need a glaze the way that ceramic does, you can use varnish to give polymer items a glossy finish. Learn about the various types of clearcoats here and then follow the links to other articles about varnishes. You can also use a matte varnish, which is not shiny.

Heat gun

Similar to a blow dryer, but with much more heat and less fan power, this tool is used in many different ways when working with polymer clay. Examples are popping resin bubbles, melting embossing powder, drying alcohol ink, and clearing liquid polymer clay finishes. While an embossing heat tool can work for some processes, you might prefer to invest in a variable heat and variable speed model from the hardware store.

heat guns are used in many ways when we create with polymer clay.
A variable setting heat gun and an embossing gun. Both are useful when crafting with polymer clay.


A process where you apply a light or metallic paint (or similar) to the tops of textures to make an item look more dynamic and interesting.


You can mix all kinds of things into polymer clay, such as ground spices, embossing powder, grated baked clay, dirt, glitter, sand, coffee, pepper, crushed crayons, and more. These inclusions can give a faux stone or granite effect. It’s more effective when at least some of the clay is translucent.

Liquid Clay

It seems counterintuitive. How can clay be liquid? Liquid clay is the same “stuff” as regular solid clay, but without the binders that make it into a putty. Liquid clay is sort of “clay juice”. It’s a milky white, syrupy liquid that cures more translucent (or even crystal clear, depending on the brand.) You can use liquid clay to soften hard clay, help pieces of unbaked clay stick together better, act as a bakeable glue, or be used as a coating. Liquid clay can be tinted or mixed with block clay to make colored syrups or various types of “runny” clay techniques, such as a faux ceramic. Bake and Bond is a type of thick liquid clay that’s generally used as a bakeable adhesive. You can learn about liquid clay here.


If your polymer clay is fresh from the factory, it can sometimes be too soft. You can remove excess oils and plasticizer by leaching. Lay sheets of the clay between sheets of plain copy paper and press under a heavy weight for 10-15 minutes. This will make the clay a bit stiffer.

You can leach polymer clay onto copy paper which will leave an oily spot.


Mica Shift

A technique that creates an optical illusion in a pearlescent or metallic polymer clay where a perfectly smooth surface looks like it has raised designs. Read my article about mica shift and the best brands of clay for it here.

Mica shift brooch made with cernit metallic.
Mica shift brooch made with Cernit Metallic.


Italian for “thousand flowers”, it’s a name for a technique in both glasswork and polymer clay where slices of canes are arranged to create a pretty (often flowered) design. (Note, the cane itself is not called millefiori, rather it’s what you make from cane slices.)

Millefiori effect made from polymer clay canes.

Mokume Gane

(Pronounced mo-koo-may-gah-nay) Layers or sheets of polymer clay are stacked, distorted, and compressed into a billet (also called a stack or block). Slices from this block reveal complex wavy patterns and these slices are used to make patterned areas in your projects. Mokume gane is named for similar technique in Japanese metalworking.

Mold Release

Polymer clay can be pressed into molds or impressed with texture sheets. The clay can stick, however, so we often use a mold release. You can use a spritz of water, a dusting of cornstarch (corn flour), or an automotive spray such as Armor-All or Son-of-a Gun. Note: If you’re using Fimo Professional, don’t use water. Water dissolves Fimo, making it stickier.

Mud Clay

No, this doesn’t have anything to do with earthen clay. Mud Clay is the blah-colored clay that you get when you mix together all your scraps. It’s usually some dull-colored version of a pinky brown, depending on the colors used in your project.

Mud is the polymer clay term we use to describe the dull clay that you get from mixing together all your scraps.

Pasta Machine

Yes, this is the same machine used to sheet noodles and linguine. The most popular pasta machine in the polymer world, The Atlas, comes from Italy and can sometimes be found in second hand shops. Learn more about pasta machines for polymer clay here. Now that polymer clay is more popular, companies are rebranding generic (cheap) pasta machines as “clay conditioning machines”. Don’t be fooled. None of them are designed to be used with polymer clay, even if they’re sold by clay companies. They’re all pasta machines.

The Lucy Clay Machine is very different, and is specifically made for using with polymer clay.

Atlas Wellness 180 pasta machine


That’s a short term for polymer clay that’s become popular recently. Not everyone uses this term.


Polymer clay is vinyl plastic and it contains a plasticizer to make it flexible (as opposed to rigid like a PVC pipe). The plasticizer is what allows polymer clay to be strong after baking, rather than brittle. It doesn’t shatter like an old vinyl record because it contains plasticizer.


Gases that collect within the clay mass during baking form small moon-shaped bubbles. Present in all clay, they’re most commonly seen in translucent clay. Additionally, some people call them “moonies”. Plaques are not caused by air trapped during conditioning. They are not bubbles.

plaques are a polymer clay term to describe moon-shaped bubbles seen in baked translucent polymer clay.
Plaques are bubble-like marks seen in translucent polymer clay after baking.


Short for pasta machine.


Plunging hot items straight from the oven into ice water. Some people believe it makes translucent clay more clear (I’ve never been able to demonstrate it, myself). However, it is pure myth that it makes clay stronger. It does not.

Ramp Baking

A baking technique where the item is placed into a cold oven and the temperature is gradually increased over a long period of time. It’s usually not necessary, but can be a good thing to try when trying to solve frustrating cracking or browning issues.


While resin is a very broad name for the components that make up many plastics, we usually use the term to refer to a type of clear material that hardens to a glossy surface. Curing is catalyzed by UV light in the case of UV resin or by adding a catalyst or hardener in the case of epoxy resin. Read my article about using resin with polymer clay here.


A silkscreen is a stencil that’s attached to a fine mesh fabric. The silkscreen is pressed to the surface of polymer clay and paint is pressed through it, leaving a design. Learn more from my All About Silkscreens eBook.

Skinner blend

A blended color sheet of polymer clay that graduates from one color to another. It’s named after Judith Skinner who developed the popular triangle method of creating this blend. There are other ways to create a blended sheet and we still tend to call them Skinner blends. (Here are some tips for making good Skinner blends.)

All pasta machines have uneven rollers, causing an uneven edge along the top.


A slab is a thick sheet of polymer clay with a decorated surface that is then cut with cutters to make shapes for earrings. Unlike a veneer, a slab is used alone and is not used to cover anything else.

Sutton Slice

A technique developed by Lisa Pavelka where a texture sheet acts like a mold and clay is pressed into the design. This clay is then removed and pressed onto another sheet, giving a raised pattern.


Covering your item during baking. The name comes from the practice of making a little tent shape over your item with cardboard or foil. Learn more about baking polymer clay here.

tenting is a polymer clay term that describes covering your items while they bake.
Tenting is nothing more than covering your items during baking.

Texture Sheet

This is a general term for any type of unmounted stamp that can be pressed to the polymer clay to give it a texture. Some texture sheets (also called texture mats) can be put through the pasta machine along with the clay, to get a deep impression. (Make sure to use a mold release!

Texture sheets are unmounted stamps used to give polymer clay texture or surface designs.
Texture sheets are unmounted stamps used to give polymer clay texture or surface designs. Selected texture sheets courtesy of Linda’s Art Spot.

Tissue Blade

This polymer clay term isn’t obvious at first. No, this has nothing to do with tissue paper or facial tissues. When slicing canes or making mica shift or mokume gane, it’s important to have a super sharp blade. Years ago, before manufacturers sold blades for polymer clay, artists borrowed from the medical field. Tissue blades are the same blades used in histology labs to slice tissue for microscopic imaging. They are incredibly sharp and will slice you just like they slice medical specimens. They also dull quickly. For this reason, save tissue blades for these specialty purposes and use a general clay blade (or scraper blade) for everyday claying. I have used the same clay blades for nearly 20 years. (I do, however, buy new tissue blades as I dull them.)

tissue and polymer clay blades


The first brand of liquid clay (and the only one for many years) was Translucent Liquid Sculpey. This same product is still available, but the name has changed many times over the years. But many of us still call the original stuff TLS. Read about Sculpey’s various liquid clays here.

Translucent or Trans

Polymer clay comes in many colors including pearlescent and metallic varieties. In addition, most brands also include a colorless translucent variety. After baking, the light shines through translucent polymer clay to give an appearance a bit like frosted milk glass. Unfortunately, no brand of polymer clay is transparent like glass. You can see examples of the various brands of translucent here.


Tute is short for tutorial. Sometimes it’s spelled out as tut. Some tutorials are just a quick series of photos that diagram a process like you can see here. Others are comprehensive educational experiences, such as the long-form eBooks and courses that I write.


A specific product from Sculpey, which is a white marshmallow-textured polymer clay that is lightweight. You can use it for making lightweight cores for heavy jewelry, among other things. Baked UltraLight is so light it floats, making good bathtoys or floating candles. It’s now sold under the Super Sculpey line, although it has nothing in common with Super Sculpey (a sculpting clay).

Sculpey Ultralight


In woodworking, thin sheets of attractive (and expensive) wood are often layered over cheaper wood to keep the costs down. Because we use the same idea of layering a pretty sheet over scrap clay, we tend to call pretty sheets of clay “veneers”. It’s common to make veneers and store them for future use. These decorative clay sheets can also be cut into shapes and backed to make pendants, earrings, etc. This is different from a slab (see above).

X-acto Knife

Also called a craft knife or craft blade, an X-acto knife is the brand name for a type of handled, pointed knife that crafters use. These knives are very useful with polymer clay for cutting, poking, lifting, and transferring small pieces of clay. This is different from a tissue blade.

What other polymer clay terms should I add to this glossary? Are there any polymer clay definitions that you were surprised to learn? Tell me about them in the comments and I’ll add them to the article. You never know what you’ll learn next!

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10 thoughts on “Polymer Clay Terms – Glossary and Definitions”

  1. Hi Ginger!
    I have a walnut hollow clay extruder. I love it but i want to find a way to attach it to a power drill. Do you know if theres a trick for this and/or if someone has created a drill bit attachment for this? Thank you!

  2. Sylvia Fruichantie

    Thank you, Ginger, for all your tips and tricks. Recently I learned about a new tool being used called a “Gelli Pad”. It is apparently a jelly-like slab you can use to transfer paint onto the raised surface of your clay project. Not sure I need one since there are plenty of ways to do that (like using my fingers, or a sponge).

  3. Thanks Ginger for your help of working with a wire frame. Love this site. Annette from New Zealand

  4. I surprised myself because I knew all the terms and definitions. Wish I’d had this a few years ago when I first started claying. However, do you have a way to get rid of the plaques in translucent clay? I ruined several things about a year ago when I was incorporating natural elements into my clay pieces.

    1. Plaques seem to just be the nature of the beast. That being said, natural things introduce air and that will leave air pockets in the clay. Once there are pockets formed, I don’t know of any way to eliminate them. Only prevent. Sorry! But I’ve also found that plaques and bubbles can also be a neat design feature that makes something look more natural, especially when making faux amber or faux stones.

  5. This is totally awesome, another great service from Ginger at The Blue Bottle Tree! Less than a week ago I introduced someone to polymer clay. This will be so helpful for her and the rest of us!

  6. Thank you, Ginger, for the pronounciation guide for mokume gane. I only just learned that the first word was NOT ‘mokelumne’, as in the Mokelumne River in Central CA, but I didn’t know what it actually was.

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