Custer Feldspar
Using Custer Feldspar Now. To illustrate what is necessary to equalize two glaze recipes, one using the pre-2000 A and B Custer and one using the current Custer being mined, I have developed a cone 10 glaze with 30% A+B Custer then have adjusted the recipe using glaze calculation software, which shows lower potassium to match the original ...