Ingredients: White Firing Ball Clay (50%) Potash Feldspar (25%) Flint (Quartz) (25%) Bentonite (5%) Colorant (15%) (Iron Oxide, Copper Carbonate, Cobalt Oxide/Cobalt Carbonate or any undeglaze colorant). Mix the ingredients with the desired colors and dry sieve the powder through an 80 mesh. Weigh the ingredients and then measure out 45% of that weight in water. For every 100 gm (4 ounces) of powder, mix in a teaspoon of sodium silicate to the water. Add the water to the powder and mix thoroughly with a fork or similar tool. Roll into a pencil shapes. After drying, fire the pencils/crayons to 800o - 900o C.
Tips: Be sure to wear a mask and gloves, if using toxic colorants. Experiment with different color percentages. Try out making pencils of different sizes, for different drawing requirements.
Related Resources:
Ceramic Toxic Materials
Thanks to Steven Goldate: http://www.ceramicstoday.com
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