[Clayart] Offgassing bisque

Robert Harris robertgharris at gmail.com
Sat Jan 29 16:17:53 UTC 2022

Pretty much the only likely chemical reactions are ones that give off CO2.

Something like a bicarbonate reaction with acid  Not saying that's what it
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


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" the
> barrels after an hour or so due to the gas given off by the porcelain. What
> is the gas?
> It doesn't happen after high fire.
> Bryan
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> https://lists.clayartworld.com/pipermail/clayart/attachments/20220128/04187aaf/attachment.htm
> >
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.clayartworld.com/pipermail/clayart/attachments/20220129/5eb48cd7/attachment.htm>

More information about the Clayart mailing list