Talbott on fri 22 aug 97
If you have a specific firing schedule that you would like for Copper Reds
then please post it to the list. It would be interesting to see what
common factors these schedules have. ... Marshall
1ST ANNUAL CLAYARTERS' GALLERY - NAPLES, MAINE (Summer 1997)
http://fmc.utm.edu/~dmcbeth/cag/naples.htm
2nd Annual Clayarters' Gallery details will be forth coming!!!
"An Outstanding Collection of Pottery Under One Roof"... A juried exhibit
Feel free to send comments or suggestions on how to make the second
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Grimmer on sat 23 aug 97
Hi,
The Cu reds that work best for me have been low in (or lacking) clay and very f
Usually 1% tin and 0.3 - 0.5% CuCO3. Boron ( dread G.B.!) seems to help the
stew by adding some stability to the melt and the opal deal is nice; you get a
liquid/liquid phase separation, like oil and vinegar. Tichane sez you get
drops of one glass floating in another.
They also benefit from high alkali, for good color response. You get some alumi
from the spar here, too. The Al2O3 needs to be down around .4 unity to really
make these glazes pop. Also a bit of Strontium can push the color response
over Calcia.
What else? Probably 9:1 Silica to alumina, .2 Boron, .35 Strontium, .2 Calcia,
..45 KNaO. I guess that adds up. I'll put this through Hyperglaze and see
what comes up.
For a Chun-type, add .5-1% Fe and .5-2% bone ash. Add titanium to a Cu red
and get a freaky purple.
Gotta run--going out for BBQ tonite!
steve grimmer
marion illinois
Grimmer on wed 27 aug 97
Richard Gralnik wrote:
>
> Hi. This is how your post on copper reds looked by the time I got it.
> Would you mind reposting?
>
> Thanks,
> Richard
Richard and others,
No problem. I seem to have problems with the way my email formats on the way
out. Sometimes the ends of lines are truncated, and sometimes carriage returns a
inserted in funny places. I guess I need to look in to that.
Anyway, here goes:
The Cu reds that work best for me have been low in (or lacking) clay
and very fluid. Usually 1% tin and 0.3 - 0.5% CuCO3. Boron ( dread G.B.!)
seems to help the stew by adding some stability to the melt and the
opalescent deal is nice; you get a liquid/liquid phase separation,
like oil and vinegar. Tichane sez you get drops of one glass floating
in another. (that's where the milky appearance comes from.)
They also benefit from high alkali, for good color response. You get
some alumina from the spar here, too. The Al2O3 needs to be down
around .4 unity to really make these glazes pop. Also a bit of Strontium
can push the color response over Calcia. (Though calcium works well.
I'd try Wollastonite as a source.) What else? Probably 9:1 Silica to alumina,
..2 Boron, .35 Strontium, .2 Calcia, .45 KNaO. I guess that adds up.
I'll put this through Hyperglaze and see what comes up.
For a Chun-type, add .5-1% Fe and .5-2% bone ash. Add titanium
to a Cu red and get a freaky purple.
Gotta run--going out for BBQ tonite! (17th Street BBQ, 5 time world Champs at th
cook offs in Memphis! Yum)
I hope this is better.
steve grimmer
marion illinois.
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