Heat and time
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July 10, 2013 at 7:55 pm #12580
Stephen RichardParticipant
The cause is usually a combination of heat and time, usually too hot for too long. You do not give details so speculation is required on my part. I suspect on piece was darker or heavier than the other. Steep moulds can also cause these uprisings. A blog post of some time ago may have some useful information: http://glasstips.blogspot.co.uk/2009/11/uprisings-at-bottom-of-slumped-bowl.html
Stephen Richard
blogs at: http://www.verrier-glass.blogspot.com/ and http://www.glasstips.blogspot.com/
