How to Make and Use Underglaze Pencils, Crayons, Pens, and Trailers

How to Make and Use Underglaze Pencils

Jack Sures, Canada, Wide Bowl (detail), ceramic ink drawing on porcelain. Private collection. Photo: Judi Dyelle.

Underglaze pencils, pens, and crayons can be great for ceramic artists who may have started with a background in painting or drawing. When you are used to working with paint brushes, pastels, or pencils to create imagery, dipping a piece into a glaze bucket, or trying to paint with glazes that are immediately sucked up by the porous bisque surface can take some getting used to. And then there’s the fact that the unfired color of a glaze is often not what it looks like fired. That’s where underglazes come in. Underglazes are basically clay-based materials with ceramic stains and metallic oxides added and they come in a variety of forms – liquid, dry, chalks, pens and underglaze pencils.

In today’s post, an excerpt from Making Marks: Discovering the Ceramic Surface, the late Robin Hopper talks about the different underglaze options available and even explains how to make underglaze pencils, pens, crayons and watercolors from scratch. –Jennifer Poellot Harnetty, editor.

PS. Here’s a great article in the archives on making homemade underglazes!

For those who are excited about the graphic possibilities of the ceramic surface and enjoy using drawing implements that have something of a sharp, scratchy or linear nature, the marks made by pencils, pens, crayons and trailers likely will make them favorite tools of expression. These tools are the foundation of written or pictographic communication in Western civilization, whereas the brush is the foundation of mark making for most Eastern civilizations. Those raised in the Western traditions usually feel more affinity with scratchy drawing tools than with the soft, calligraphic brushes. Fortunately, the range of ceramic decoration tools encompasses both soft and hard possibilities.

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Ceramic Underglaze Pencils

Regular pencils, with what we call “leads,” actually are made from graphite of various degrees of hardness from 6H (extremely hard) to 6B (extremely soft). Marks made with graphite pencils on ceramic surfaces will burn out in the firing, which can be very convenient, as the firing erases the guidelines or grids used for painting or drawing on patterns and designs in ceramic pigments. Guidelines also can be painted on with vermilion watercolor paint, which also burns away.

Trailers, ceramic pens, and underglaze pencils.

Trailers, ceramic pens, and underglaze pencils.

Ceramic underglaze pencils (to make marks that don’t burn out in firings) are made with combinations of refractory materials, clays, and colorants and are usually only commercially available in one level of hardness that would probably equate to the HB rating of a graphite pencil. HB hardness is midway between 6H and 6B. Companies that produce ceramic pencils have a habit of coming and going, but most ceramic supply houses usually will be able to find and supply them. Pencils are commercially available in a very limited variety of colors.

Ceramic pencils are normally used on bisque-fired clay that has been sufficiently hardened to withstand the pressure needed for satisfactory mark-making. Since the trailers, ceramic pens, and pencil “lead” may be quite fragile in use, the smoother the clay surface, the better the drawing. Bisque surfaces can be smoothed by sanding with wet and dry silicon carbide or aluminum oxide papers, or the surface of the greenware may be sprayed or brushed with a terra sigillata coating prior to the bisque firing to provide a harder working surface. Ceramic pencils may be used on the ceramic surface just like their graphite equivalent on paper. Although sharpened points tend to wear quickly on the abrasive ceramic surface, the combination of pencil tip marks, side-of-pencil marks, and the opportunity to create tones through finger-rubbing or smudging the soft image gives wide potential for drawn imagery development.

underglaze pencils

Verne Funk, California, USA, Split—Portrait of the Artist, 18 in. (46 cm) in diameter, wheel-thrown whiteware, underglaze pencil, glaze, 1996

If the commercial underglaze pencils are too soft for satisfactory use, it is quite easy to make your own and harden them to a more satisfactory and less friable state. Ceramic pencil drawings can be fired onto the bisque-fired clay to harden them before glazing, or, alternatively, they can be fired on unglazed high-fired clays, such as porcelain or stoneware, without the need for a glaze coating.

The selection of colorants or mixtures of colorants used in the coloring of the “lead” will control the effectiveness of the drawings at high temperatures, but most will tolerate cone 10.

To make ceramic pencils and pastels, use a porcelain-type slip with 50 percent white firing ball clay or plastic kaolin. For dry strength in the green state, 3 percent macaloid or 5 percent bentonite should be added.

Ceramic Pencil Slip Recipe
White firing ball clay 50%
Potash feldspar 25
Silica 25
Add: Macaloid (or 5% bentonite) 3%
Colorant (maximum) 15%

The materials, including colorants, should be dry sieved through an 80-mesh screen to ensure thorough blending. For color, you can use mineral oxides, carbonates, and prepared stains. A variety of combinations will produce a wide range of colors, although it’s important to select colorants that won’t burn out at high temperatures; not many will, but cadmium/selenium and potassium dichromate are likely to do so. The amount of colorant can be up to 15 percent. More than that will cause loss of plasticity in the raw state, making it difficult to form the pencils. The more colorant used, the more intense the color.

Mix the dry materials with approximately 45 percent water, to which 1 percent of sodium silicate per 100 grams of dry material mix has been added. This will slightly deflocculate the slip, giving additional green strength while also intensifying some of the colorants.

Form the pencils by drying the colored slip to a plastic state, and then either rolling out coils or extruding lengths of the desired thickness. These then can be left as pencil lengths or cut into shorter 1–2 inch lengths. When dry, fire the pencils to between 1472°F (800°C) and 1742°F (950°C), depending on the desired hardness. A lower firing will produce softer “lead”; higher firing, harder “lead”. The short lengths can be placed in a claw grip drafting pencil (the Koh-I-Noor No. 48 drafting pencil can hold leads up to ¼ inch in diameter).

Pastels normally are used from the greenware state and are not prefired unless they prove too friable for convenient use. To make pastels, use the basic recipe above and simply form the clay into coils or extrusions to the desired size for use. If they prove too fragile, they can be fired to between 1112°F (600°C) and 1472°F (800°C) without making them excessively hard. Ceramic pastel drawings should be fired on the ceramic object to harden them before a glaze is applied; otherwise, the powdery surface likely will be spoiled in glaze application or handling. Surface powder also might cause crawling through lack of glaze adhesion.


To make wax crayons, mix the dry recipe above with ordinary commercial wax resist. Form the crayon, and let it dry. Since the crayon will contain some latex, it also will have a slight resist effect on the work, particularly when used on bisque-fired ware. For a crayon with greater resist qualities, stir colorants into wax, let cool, roll the wax into rods of different widths, and cut the rods in convenient lengths.

Underglaze Pens

Underglaze pens are like super-fine trailers containing an “ink” that gives good flowability for drawing. They are available commercially from a number of producers, or you can make your own with the fine trailers that are available. You can also dip any form of “nibbed” pen, from fine-pointed mapping pens, to quills or sharpened bamboo, into ceramic ink.

Black Ceramic Ink Recipe
Calcium borate 30%
Potash feldspar 30
Ball clay 25
Silica 15
Add: Bentonite 5%
Mason Stain 6600 or other black stain 10%

Thoroughly dry-mix these ingredients, then add a mixture of water and 5 percent sodium silicate (100 milliliters water to 5 grams sodium silicate). Pass it through a 100-mesh sieve twice. Thin the ink as appropriate for your use. This ink should work at all temperatures up to cone 12. It can be thinned to produce pen and wash-like drawings or used with a ceramic watercolor or glazes. Other colorants also can be used with this base.

underglaze pencil katz

Lynda Katz, USA, Bayou Boogie Woogie, 13 in. (33 cm) in height, thrown and faceted porcelain, underglaze pencil drawing with luster glazes, 1984.


For watercolors, the materials are mixed together, then enough water is added to make a slip, which is passed through an 80-mesh sieve and poured onto a plaster surface. When dry to the touch, watercolor cakes can be made by forming rounds or squares of the colored slip and letting them dry completely. They then can be used like ordinary children’s watercolors by wetting the surface with water and applying with a brush.

Ceramic Watercolor Recipe
White firing ball clay 50%
Potash feldspar 25
Silica 25
Add: Macaloid (or 5% bentonite) 3%
Colorant (maximum) 15%

underglaze pencil

Lynda Katz, USA, Covered Jar, 8 in. (20 cm) in height, thrown, altered, and hand-built porcelain, glaze-trailed decoration, 1997.


A wide range of trailers for slip, ink, glaze or overglaze uses are available from ceramic suppliers, kitchen stores, and drugstores. They usually consist of a rubber or neoprene bulb or container and a nozzle with a fine-aperture tip, or sometimes multiple tips. The simplest to find is usually either a hair coloring applicator bottle or a child’s enema rubber bulb from a drugstore.

Ceramic suppliers often have fine-tipped trailers, sometimes with interchangeable tips of differing aperture. The aperture of the tip required depends on the thickness of the material being squeezed through. Thin inks will go through a fine tip without clogging, but a wide tip may be needed for slips or glazes to flow properly.

As with any tools, you’ll need to practice to get the correct “feel” to achieve the best results. Keep a thin needle tool nearby when working with trailers, because the fine ones tend to clog quite easily.

**First published in 2009.
  • Nina D.

    A waste of time and materials. I made about 100 in white, purple, chartreuse, blue, and green colors, fired to cone 020. The marks they make on bisque ware are too faint, rub off with your finger, make tons of dust, and all the colors look very pale. I followed the recipe to the letter. I used the correct amount of mason stains.

    And no way could they be used as pastels before they were fired. Also the amount of water at 45% makes for extremely hard wedging. Sifting the dry materials through 80 mesh 2 times screen was another total waste of time. There was just no reason for it.
    If I were to attempt this again I would use more water, not sift dry ingredients, 4 times as much mason stain, more sodium silicate and fire at 500 degrees F to start. As a test I made a crayon shape with some homemade slip and fired it with the rest, and that came out better – softer with a more vibrant white.

  • Dorothy H.

    I have a leather hard piece and wonder if using a crayon on the lines then bisque firing would work? I’d like to use a clear glaze on it and wonder how that would work with the bisqued fired piece.

  • Marlies B.

    Thanks for posting this great article!
    I am trying to find a recipe ^6 glaze that does work over underglazes. Every attempt with ug flails…My underglazes burn out, I think I use the wrong recipe for the glaze on top…

  • I have a bisque cookie jar that I painted with under glaze back in the 1956 to 1960’s. Want to finish painting it but was told to wash it off as the paints had lead in then and will explode if I don’t wash it off. Tried washing it off but it doesn’t come off. What to do now????

  • nicki g.

    has anyone tried this pencil slip recipe? I tried making it with mason stain #6385 Pansy Purple and the “lead” came out super light pink (the color of the stain as is is a dark blue/purple) and chalky, it doesn’t even stick or harden when fired onto a test tile to cone06.

    Suggestions? I want a deeper darker color (more stain perhaps? how much?) and the ability to fire it onto bisqueware so i can put a clear glaze over it (more flux?)


  • Gladys C.


  • Gladys C.


  • Gary L.

    I use livestock syringes with varying needle sizes to apply slip decoration. They are remarkably inexpensive and have varying needle sizes. I am from Montana, but any livestock supply store would have them.

  • Korey A.

    What a fantastic resource! I am always more interested in making my own supplies than buying ready-made. Thank you for all the wonderful recipes and information!I will be making my own ceramic drawing materials very soon.

  • Joanie C.

    I, too, am an art teacher, and have pondered developing something similiar, yet I lack a strong chemistry background. Theoretically, I have a willing chemistry teacher, but reality has made it difficult to even meet. However, I would dare to hypothesize that some proof of procedures and results could be a catalyst for a collaboration! James, if you had info to share, especially in chemistry teacher language, that would be fabulous.
    Perhaps you could adapt this: When I worked at the elementary level, I wrote a grant that enabled us to purchase culture plates and pipettes which we used to mix and apply colored dyes to silk, along with Solution 1 and 2 and Substance 1 and 2: AKA sugar and salt, Students observed both resistance (sugar/water solution) and absorption (salt crystals). Artistically, well, it was sticky mess at best, but the kids had fun learning how to record results, and mix colors and use ‘fancy’ equipment.

  • I wish my chemistry teacher had taught through art… I am sure I would have had much better grades. I have worked with tiles and slip trailing in the past and it is a very versatile way of decorating. It is also interesting to find where people get their trailers. Some of the bulb trailers I have used from commercial places splutter or clog. I like the idea of the hairdressers bottles.. think I will speak nicely next time I get there.

  • Vonnie M.

    I am an art eacher trying to understand the chemistry of glaze color and chemistry. Can you elaborate on the lesson/project??? It sounds very interesting.

  • Robin H.

    For those who enjoy using trailers, some of the best glaze and slip trailers that I have ever found are those that come from Tuckers Pottery Supply. They are made in Germany and come with different sized tubes for differing viscosity of liquid. I am currently working on a lot of two-dimensional work and these trailers are perfect for what I need. Check out:

  • Robin H.

    It is great to be able to help people understand, use and develop this medium. I get a huge amount of pleasure through opening doors. Many suppliers and manufacturers have good on line service. For ceramic pens I think the best are those developed by Axner company and now sold through Laguna Clay. They also have a wonderful new grey/black underglaze pencil …here is a web page with info.

  • Wendy S.

    Thank you for posting this wonderfully informative excerpt. I’ll be looking forward to trying some of these recipes and techniques!

  • Greg M.

    Where is a good place to find Ceramic pens and pencils online? I have been looking for quit a while and have found nothing commercially availabe.

  • James S.

    Thanks a lot. I am a chemistry teacher and I am looking for ways to incoporate art into chemsitry. I have students make glazes and decorate a small tile. This gives me more options for teaching the relationship between color of art materials and chemistry.

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