Boro glass is affected less by heat and cold than any of the soft glasses. That said, you can take the glass you plan on working with and put it on top of your kiln when you turn it on and it will warm it as the kiln heats up. That way you can pick it up and put it in the flame to work without having to start it out at the end of the flame to warm it before working. I do that when it gets cold here.
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