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copper colour stabilisation was copper frit

updated sat 11 feb 06

 

Ivor and Olive Lewis on fri 10 feb 06


Dear John,

Somehow or other you seem to have gone off track with this thread.

I asked for assistance in getting recipes that would comply with the =
Seger Formula for a Copper Silicate Frit. The recipes you suggested did =
not contain any Copper, either as Cu2O, CuO or Malachite

The Seger Formula was 1CuO:1CaO:4SiO2.

I see combinations of Black Copper Oxide, Red Copper Oxide or Malachite =
with Whiting or Wollastonite and Ground Quartz or Ground Flint as having =
potential with melting or fluid phase sintering encouraged with a small =
proportion, say 5 to 10% of Anhydrous Sodium Carbonate. Although Borax =
could be used I would like to avoid that chemical in this instance.

Given those restrictions, do you wish to continue ?

As I suggested in an interim post, I have a recipe with a little mental =
arithmetic. Now for a Cool Day ! ! !

Best regards,

Ivor

=20