Too hot, too long
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December 5, 2013 at 7:43 pm #13123
Participant
Unless the bowl has a lot of detail, 630C would be fine. At 683C, 60 mins is far too long. Slumping at low temperatures usually gives good results. If you want, you can look at my blog for comments on slumping variables.
Stephen Richard
blogs at: http://www.verrier-glass.blogspot.com/ and http://www.glasstips.blogspot.com/