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The fired pieces appear to be made from black porcelain. But this is L3954F cone 6 black engobe over a white porcelain. 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 engobe recipe is tuned to have the same degree of vitrification as the body, in this case M370, so pieces don’t stick to the kiln shelf during firing. Of course, this procedure rewetted the bases of the leather hard mugs, extending drying time so extra precautions were needed to avoid cracking. For example, I painted wax emulsion on the handle outers and covered them all in cloth and plastic for a day to slow down drying.
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