Excerpt from Studies in Glazes, Vol. 2: Crystalline Glazes
Crystals have been produced in glazes having a wide variety of compositions, and at nearly all temperatures. It would be aside from the purpose of this paper to review all the types of glazes which have been reported ... as crys talline, except for the sake of establishing the fact that there may be a wide variation in their composition and heat treatment, and to demonstrate that in a thorough study, such as is indicated in the title, it would be impossible to deal with more than one type. The following formulae are sufficient for these purposes.
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