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The glaze is G2926B, our standard base transparent. The Zircopax (zircon) is Ultrox Z+. We made a range of test pieces and found these two versions remarkably similar. The tin oxide version is a little bluer for some pieces, on others it was difficult to distinguish them. We even tried the two glazes on a jet-black engobe, the opacification was similar there also. The cost? $8/kg for the tin version, $5.25 for the zircon version (current retail pricing in our area). But a critical issue is crawling, 10% zircon whites are notorious for this. We thus now use mix of tin and zircon (3% and 5%).
Materials |
Tin Oxide
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