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This is L3954F cone 6 black engobe. Multiple factors make this work. First, a non-gummed dipping engobe will not work for this (it will not apply by brush evenly or thickly enough). This brushing version mixes 500 grams of L3954F powder (with black stain) into 280g water and 75g of Laguna Gum Solution. Second, the recipe is tuned to have the same degree of vitrification as the body so pieces don’t stick to the kiln shelf during firing. Of course, this procedure still rewetted the bases of these leather hard mugs, extending drying time so extra precautions were needed to avoid cracking: I painted wax emulsion on the handle outers and covered them all in cloth and plastic for a day to slow down drying. The fired pieces appear to be made from black porcelain.
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