Crystalline Glaze Chemistry   Several have inquired about this specialty glaze in recent months, so I thought I would post an introduction into crystalline chemistry. The very first thing to do with this glaze is: throw out your glaze calculator and UMF spreadsheet: they do not apply to this glaze nor can you bring it into unity.   Basic  cone 6 through 10 crystalline recipe is: 50% ferro frit 3110, 25% zinc oxide, 25% silica 325m, and a seeding agent (see later). ^