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A favourite technique for the use of underglazes is sgrafitto. Apply your normal three coats and let dry. Transfer a pattern to piece and, with a sharp tool, scribe or cut through the underglaze into the greenware. You should slightly dampen lines you are scribing to prevent chipping. When completed, fire as normal, then add covering glaze and fire again. Scribed lines will show white through your underglaze covering.
|Jennifer Mathes, Ph.D.|