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Interestingly, if lime is present in the clay body as a powder the forces of expansion are not sufficient to crack the clay. In low fire white clay bodies powdered limestone (composed of more than 80% calcium or magnesium carbonate) is often added to prevent glaze crazing (a fine network of lines in the fired glaze). 1. When used in earthenware glazes large percentages can cause crystal growth. In high temperature glazes limestone in powder form acts as a flux bringing other glaze materials i...