Periwinkle blue turned matte gray

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    Just completed 9″ plate with a large portion of background being this periwinkle blue. Did a tack fuse to 1340º. Of course when I saw the boring gray color after firing, I researched and discovered this frequently happens unless devit used or clear glass laid on top (back side with clear glass is fine). Is there ANYTHING I can do short of a full fuse to get the top back to the blue? Devit and fire again? What  is the lowest possible temp to keep contour and ‘burn off’ gray? If I lay clear glass on top of this blue portion I’m afraid it will distort piece. Any tips or help is greatly appreciated!


    P.s. I WISH I had known that this could happen before firing… 20 hrs of layout work involved with this piece :(


    Is it possible you are seeing this:

    If so, you can (carefully) clear-cap the glass with a very thin layer of clear powder and it will eliminate the oxidization that you are seeing.

    Helios Kiln Glass Studio



    Thank you for the tip on the powder Paul. Looks like that is definitely an item I need to keep in stock! I now need to repair the plate, as it cracked during the slump fire. Any advice on repairing cracks? Thanks again :)

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