Talbott on tue 22 jul 97
Small bumps or pits?... if small bumps then that sounds like it could be
small stones which are present in your claybody.... I understand that
staying in oxidation throughout the bisque fire is necessary to get rid of
carbonaceous materials in the claybody... Since we fire gas I am careful
to do so. We fire stoneware and porcelain and bisque to ^06 and then
glaze fire later to ^9/10...
From time to time we have had small stones (1/8" diameter or less) to
appear just under the glaze after firing.. We mix our own claybodies and
do not sieve the ingredients... We have not had any stones to appear now
for over a year...problem was probably a bad batch of grog which contained
the stones... No amount of bisquing will get rid of stones obviously...
....Marshall
>----------------------------Original message----------------------------
>Greetings everyone. Lately i have been noticing more incidences of bloating
>once a piece is fired- small bumps in the clay body only noticeable after
>the glaze firing. ....This happens both in my wood-fired kiln as well as the
>electric, and at a workshop with Jack Troy, he noted that soaking a bisque
>firing when at temperature will burn out anything that needs to be and
>solve the problem. Trouble is, I didn't ask enough questions, and am
>wondering what others do for soaking. I have an L&L kiln with 4 rings and 4
>switches, and I've just been guessing at the soak length and how many
>switches to leave on for how long. So, if anyone can give me advice on the
>fine points of a bisque soak I'd appreciate it. Do you leave all switches
>on but set at low? Or just a couple of rings going? I do not use a kiln
>sitter, just cone packs in there, and want to avoid spending money on more
>equipment to measure temperature. I guess the big question is how long it
>takes to burn out the bloating bugs and to do it but not overdo it. I'd
>also be interested in hearing what people do when soaking a glaze firing-
>again- how many switches, set where, and for how long, and what the
>advantages are . i have heard glazes are "richer" and more beautiful whan
>they are soaked, but wonder technically why and if people have found that
>to be true. (Not talking about crystalline process) So thanks in advance
>for any help out there!
>Joan Slack-DeBrock/River Run Pottery
>P.O.Box 95
>McNaughton, WI 54543
>715-277-2773
>riverrun@newnorth.net
1ST ANNUAL CLAYARTERS' GALLERY - NAPLES, MAINE (Summer 1997)
http://fmc.utm.edu/~dmcbeth/cag/naples.htm
Celia & Marshall Talbott, Pottery By Celia, Route 114, P O Box 4116,
Naples, Maine 04055-4116,(207)693-6100 voice and fax,(call first)
WBS Live Chat Room, Sat Nites 10 PM EDT, Private Room: Clayarters
E-MAIL: clupus@ime.net
| |
|
