These
pieces are very easy to heat shock, so the initial rate of advance
needs to be much slower than for any piece of the same size, possibly
less than half the usual rate. This slow rate should be steady
without pauses until about 540ÂșC, which is above the annealing point
of most fusing glasses. At this point you can speed up the rate of
advance to whatever your normal one is.
Of
course, it is best to anneal each piece on each firing to the extent
that there is no question that the piece is properly
annealed. Looking at the Bullseye project notes and the annealing of
thick slabs can help for evenly thick items. For tack fused and
items of uneven thickness, you could review this posting.
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