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copper sulphate?

updated wed 9 sep 98


Nalis W. Giles on tue 8 sep 98

I have run across a small amount of copper sulphate and heard that it is
used to produce rainbow effects in raku glazes. I have only been doing
raku for a couple years( total) , but have aquired quite a few raku
glazes none of which have copper sulphate.
Any clues? Any advice? Any recipe's?

many thanks in advance