Hank Ray on mon 22 mar 99
Hello All.....
I was rereading Pete Pinell's article in Clay Times about copper reds today...
decided to mix up a batch... and give this copper red thing a try....
in the article he talks about how copper reds form on the cool down... but
says if you get a clear glaze then reduction wasn't started early enough.....
i usually start body reduction at cone 011 - 010 and reduction all the way
to 10
how do all the copper red folks fire?????
I ask this... cause i tried copper reds once and got a clear glaze..... i
have a better handle on firing,,,, then i did back then......
Pete in OKC, OK after a long day of firing the big kiln.........
Stephen Grimmer on tue 23 mar 99
Hank,
I fired a lot of Pete's Copper Red in undergrad school with pretty
consistant results. Moderate reduction (I think 8 or 9 on the CO2 analyzer)
started at ^012, and then eased up a bit around ^01 to quite close to
neutral (around 11 or 12% CO2). Then, a little more at ^9 for an hour or so
until tens were at three, then oxidize to beat all for 30 minutes. We closed
the kiln up tight for an hour or two for the matte glazes and then pulled
the damper and burner ports to crash the temp down to dull red heat. After
that, it got clammed up again until the next day for unloading. With this
schedule, it was pretty common to get pots that looked like cranberry juice
or candy apples. I hope I haven't given the wrong CO2 numbers.
You have to get the glaze on pretty thick for a good red, and that can
invite running. To quote the estimable Victor Babu:"If you hold the pot in
the glaze and say Pinnell five times, you'll have a @#$%ing winner."
One caveat: those glazes are way high in Boron and seriously short on
alumina. This makes for really runny glass that scratches bad if you even
get close with a green scrub pad. Crazed? You bet!
good firing
steve grimmer
marion illinois
----------
>From: Hank Ray
>To: CLAYART@LSV.UKY.EDU
>Subject: Pete's Copper Reds
>Date: Mon, Mar 22, 1999, 3:18 PM
>
>----------------------------Original message----------------------------
>Hello All.....
>I was rereading Pete Pinell's article in Clay Times about copper reds today...
>decided to mix up a batch... and give this copper red thing a try....
>
>in the article he talks about how copper reds form on the cool down... but
>says if you get a clear glaze then reduction wasn't started early enough.....
>
>i usually start body reduction at cone 011 - 010 and reduction all the way
>to 10
>
>how do all the copper red folks fire?????
>
>I ask this... cause i tried copper reds once and got a clear glaze..... i
>have a better handle on firing,,,, then i did back then......
>
>Pete in OKC, OK after a long day of firing the big kiln.........
>
Dorothy Weber on tue 23 mar 99
FYI Copper Reds - I start modest reduction at Cone 016 and leave all settings
the same through Cone 10/ll, then oxidize for 30 minutes. You might also try
to re-light the kiln and fire in oxidation after the kiln has dropped about
500 degrees for another 20 minuets or so to slow down the cooling process.
Great reds!
Dale Mark on thu 25 mar 99
Hi Hank
I start reduction at either cone 010 or 08 or 06, depending on what the
hand picks out of the cone box, until cone 10/11. Reduction is on the
heavier side of moderate. Kiln cools on its own time.
Dale Mark
Hamilton, Ont.
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