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I'm having difficulty getting copper and red colors from copper foil inclusions with float glass. I've have cleaned the foil with acetone, soap and water and sprayed both the foil and the inside faces of the glass with super spray or borax. I also have put the tin side to the outside and left at lea...

I've been firing 3 1/2" x 3 1/2" squares with 3" sq. copper foil inclusions allowing a 1/4" border on all sides. They are coming out dark blue with grey ash highlites. I have scrubbed the copper foil with steelwool and acetone followed by soap and water. Iv'e faced the tin side o...