I received a beautiful green that came out of a line blend of 28 tiles. It was a vibrant, rich, and glossy color- but it had severe crazing (picture attached). Its colorants were copper sulfate and rutile. Interestingly enough, only the tiles in the line blend that contained copper sulphate had crazing.
I tried to â€œfixâ€ the problem by increasing/decreasing the silica by increments of two, eight times, only to see no change whatsoever.
The information from both of the paragraph above have led me to conclude that copper sulphate is the culprit! But I am no glaze expert- maybe I am missing the mark.
Does copper sulphate encourage/increase crazing? Is this problem worth solving? Any thoughts/insight/experiences would be greatly appreciated!
Neph. Syen 67
copper sulphate 5%