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Hi Guys, I am looking for answers everywhere........Maybe I will find it here......... I have mixed up a iron red glaze that I did not mix for a while. I used ingredients that is 10 years old and older. The end result was a flat brown instead of the rich red brown that it was before. I repeated the recipe, thinking I made a mistake, ending up with the same results. Then I thought maybe I used the wrong recipe and compared it with similar recipes getting to the conclusion that I did not make a mistake. So someone said the problem is the iron that changed over time. This was the first time I heard that in all the 36+ years I am in clay. Is that true and if so, can I fix the iron, or do I trash it? I assume that if that is true, it has to do with the oxidation process. Then someone mentioned the bone ash - artificial versus real, which raised the question with me if the bone ash may "expire", since I used the real thing. As I said: I used the exact same materials that I used on porcelain before. All these (except the silica and maybe the Custer) came from batches that I had in my studio for the best part of 15-18 years. (yes I have some valuable materials.....) The recipe is no secret, it is similar to many others available online, but the reason I want to do it again is because over time some of the plates that I glazed with it, wore off, which told me that there is maybe not enough silica in this recipe. So I want to alter it some, but first need to make sure I have the color right. Ralphâ€™s Terracotta. Custer F. 41 Talc 9 Bone ash 13 Lith Carb. 2 Kentucky Ball clay 13 Silica 13 Add: Iron ox 9 Ideas please........... PorcelainbyAntoinette TeachinArt