[Clayart] Offgassing bisque
robertgharris at gmail.com
Sun Jan 30 02:17:23 UTC 2022
I was assuming that the tumbling was done in water. It sounds like everyone
else is assuming it's done dry. (at least I'm assuming there wouldn't be
much frictional heating with water).
Which is it!
On Sat, Jan 29, 2022, 16:45 paul gerhold <gerholdclay at gmail.com> wrote:
> I would look at what chemicals are used to color the bisque. Maybe some
> decompose at low enough temp that just the friction heating would cause
> decomposition to occur.
> Sent from my iPad
> > On Jan 29, 2022, at 12:40 PM, Robert Harris <robertgharris at gmail.com>
> > Pretty much the only likely chemical reactions are ones that give off
> > Something like a bicarbonate reaction with acid Not saying that's what
> > is, just more likely. See if the gas puts out a match. You could see if
> > adding a bit of vinegar speeds up the evolution of the gas.
> > Only other possibilities, both fairly farfetched would be hydrogen (match
> > wil light it - stand back) or hydrogen sulfide (which would be really
> > obvious).
> > Robert
> >> On Fri, Jan 28, 2022, 08:44 Bryan Johnson <bryj at cheqnet.net> wrote:
> >> When I tumble polish bisqued colored porcelain jewelry I need to "burp"
> >> barrels after an hour or so due to the gas given off by the porcelain.
> >> is the gas?
> >> It doesn't happen after high fire.
> >> Bryan
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