Dianne Kirwin on wed 6 oct 04
any suggestions why terra sig would blister and flake off the pot when
pit fired?
it was applied at leather hard stage and bisqued to 06 with no problem.
(what remained on the pot gave the most amazing color i've ever gotten,
wouldn't you know!)
dianne
Warren Heintz on wed 6 oct 04
I applied a terra sig, made from a low fire white clay
ballclay, on to a terra cotta piece. After the bisque
and opening the kiln there was this beautiful smooth
white finished piece of figurative sculpture. When I
lifted it from the kiln the terra sig shattered and
fell from the piece. What I think happened is that
there was a difference in the shrinkage of the two
clays,but what do I know? On the other hand I used the
same terra sig,on another piece applied to a raku clay
body and had no problem after the bisque. And then
later was put into a saw dust firing which produced
very fine results.
--- Dianne Kirwin wrote:
> any suggestions why terra sig would blister and
> flake off the pot when
> pit fired?
> it was applied at leather hard stage and bisqued to
> 06 with no problem.
> (what remained on the pot gave the most amazing
> color i've ever gotten,
> wouldn't you know!)
> dianne
>
>
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Bonnie Staffel on thu 7 oct 04
Diane, I have worked with terra sig for quite a long time. At first I also
had the flaking problem. However, I have found that three very watery thin
coats on DRY clay works the best for me. I polish between each coat, only
applying about three or four square inches at a time, moving around the pot.
At present I do not use terra sig at all as I am looking for a finish
reminiscent of ancient excavated relics that I found in Guatemala. Just did
a pit fire yesterday and the pots came out a WOW. With the method I use, my
background is black with color and patterns of the copper and fire which
give my pots a different look. Hope I can get pictures taken of them today
before they are picked up for a show opening at the Crooked Tree Art Center
tonight.
Regards,
Bonnie Staffel
http://webpages.charter.net/bstaffel
http://www.vasefinder.com/
Potters Council member
terryh on fri 8 oct 04
Dianne Kirwin wrote:
>any suggestions why terra sig would blister and flake
>off the pot when pit fired?
>it was applied at leather hard stage and bisqued to
>06 with no problem. (what remained on the pot gave the
>most amazing color i've ever gotten, wouldn't you know!)
>dianne
dianne,
i don't know about your clay. and neither how you apply
terra sig.
a way i do differently is: to apply terra sig at bone-dry
stage. also, not necessarily to prevent flaking but to
keep surface sheen, i bisque to O9-O10.
hope this may help.
terry
terry hagiwara
terryh@pdq.net
http://www.geocities.com/terry.hagiwara
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