I don't do boro at all but with my soft glass I wait until it gets down to 200 and even then I might just transfer stuff from the kiln to some kaolin wool blankets.
They have them or something like them in the hardware store that the plumber puts behind the copper pipes they want to solder together to keep from setting the house on fire.
Only my two cents and worth every penny you paid for it.
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The Zombie Apocalypse is Upon Us.
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