Ron Roy on wed 10 oct 01
Hi Merrie,
I have done some testing on this kind of glaze - I needs to have more
copper in it than can be held in solution during cooling. This leaves
copper oxide in a film on top of the glaze - you are right - it will taint
acid foods - try leaving some vinegar on it over night - I think it will
change colour.
I tried to reduce the copper, increase the silica - trying to make it more
stable but the colour changed what ever I did.
RR
> Now, let's talk about this glaze.........
>ORIBE ......cone 10 to 13
>custer feldspar 49
>whiting 15
>kaolin 12
>flint 25
>copper carb. 7
>In the wood firing, it can turn mauve with green, or green with bright red
>on high spots, or green with mauve, or mauve breaking bright green on high
>spots with bright red, or bright green and bright red. It is so full of
>surprises ! What do yall think ? Is it food safe, stable, does it have too
>much copper for a lemonade cup?
>Merrie in Mississippi
Ron Roy
RR# 4
15084 Little Lake Rd..
Brighton,
Ontario, Canada
KOK 1H0
Residence 613-475-9544
Studio 613-475-3715
Fax 613-475-3513
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