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Color change under the glaze
Posted by Tom DeMaria on July 20, 2018, 11:57 am
I have several pieces of early flow blue (Temple, Pelew) that are perfect except that on areas of the plate parts of the pattern show these purple colored dull lines. They seem to trace areas of the design and are not random lines. It is as if a reaction has talken place and part of the cobalt blue is deteriorating. They dull discolored libes really stand out against the deep cobalt of the plate. They disappear when the plate is angled to the light. Sorry I can not capture this photographically. What caused this damage to an otherwise perfect plate?