Dirty marks on the glass - devitrification

Well after some searching on how to use the fire rope I recently got from Pearls Creations, I found out why I was getting those dirty marks on the glass after grinding it and firing it again.

It is called devitrification. Any grime left from the grinding process may cause devitrification in further firings. So it is important to always wash the glass throughly after grinding. I have found this out now! I thought I had washed it enough but obviously not. I already have another piece which I have used the grinder on ready to be fire so I hope that this doesn't leave any dirty marks. But we will soon see.

I have new photos to put up and some more experiments so I will post them up soon. Going to have some lunch now!


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