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December 8, 2006, Newsletter Issue #219: Understanding %īs
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Tip of the Week
Glaze recipes are typically expressed by listing each raw material and its % by weight. The percentages add up to 100 Usually colorants and sometimes other additives (such as bentonite for suspension) are not included in the 100%, they are added on afterward. Example: Cone 6 Clear Base Glaze
Wallastonite 10% FRIT 3134 30% Kaolin 25% Flint 15% F-4 Feldspar 20% Total 100% Add 4% cobalt oxide for a deep blue To mix this glaze, you take the total number of grams of dry material you are making, multiply by the % to get the grams of each material to add. Example: To make 1000g of glaze Wallastonite = 10/100*1000=100 grams FRIT 3134=30/100*1000=300 grams Kaolin = 25/100*1000=250 grams Flint = 15/100*1000 = 150 grams F-4 Feldspar = 20/100*1000 = 200 grams To double check, add up all the grams and make sure they equal 1000. Then add 4/100*1000 = 40 grams cobalt oxide This is as far as many people go. They make the glaze, test it, and often are unhappy with the results. We need to understand why!
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