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Thanks one and all for your replies. I will follow up the silver contamination and be more careful with the working relationship of the two materials but I don't think their has been any cross contamination. i rang up my supplier just in case other people had the same problem. She informed me that t...

thanks Rosanna and Bert for your reply. I have been careful to seperate the glass and silver , so I can pretty well guarratee that there is no silver contamination. I am firing up to 800 and I can get anything from one to three firing out of each mould. The discolouration isn't obvoius in the plaste...

I have been slumping float glass of a 50/50 plaster/silica mould. i have been getting a discolouration in the mould that is leaving a small yellow mark in various places on the float glass. i have used distilled water for the mix and changed my plaster supply several times. i am now thinking that it...