True insight-live.com/glossary/210">functional mattes have fluid melts, like glossy glazes. They need this in order to develop a hard, non-scratching, durable glass. The mechanism of the G1214Z1 matte on the right is high Al2O3, it is actually melting more than the glossy G1214W on the left (this was fired between cone 5 and 6, it normally runs right off the runway).
Pages that reference this post in the Digitalfire Reference Library:
Al2O3, G1214Z1 - Cone 6 Silky CaO matte base glaze, G1214Z Cone 6 matte glaze, A Textbook Cone 6 Matte Glaze With Problems, Tune your glaze to the degree of matteness you want, Matte Glaze
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