Malone & Dean McRaine on fri 12 dec 97
Aloha:
Have you been able to get reds by just adding silicon carb. to a standard
recipe or do you need to develop one for Oxidation? I've gotten some reds
but they weren't that good-pitted somewhat, crazed, not there if the glaze
was thin. Any thing special about the firing?
Dean in cool and windy Kauai.
Bill Edwards on sat 19 apr 03
Hi,
I havent had a chance to get involved lately with any
discussion but I do read the list or at least thumb
through it. John H. and Ron R. have what looks like a
pretty bright chrome red and of course I have spent
way too much time with reds in oxidation but here some
points.
I have used cadmium in limited tests. You can get red
but you can't afford it most likely if your looking
for LOW COST. I do not store cadmium and no longer
even test it. Inclusion colorants are bright and
stable at least to ^6+. The base for these must be
supportive as it would be for any glaze that develops
red or you will get a nasty pink or worse.
Chrome reds usually do best in low AL203 high lime
glazes, with minimal boron.
Also most that work well have a period of time they
work best from the bucket. Not to say they aren't
stable from the get go in some glaze bases but since
we are talking about chrome tin and the tight
chemistry I have used, I find that they will be best
used after a week or so of setting and as time goes by
the will deepen in color. You could reduce the
chromium till this tops out but its a game of wait and
see and testing. There is a toss up. Stable in the
bucket may not lend to the best red, If only it did!
This can only be discussed in great detail and too
much time has been invested already by me. The Red
October is a good starting point or perhaps the Ron
and John glaze. Be careful in regards to some white
using tin that you may have in the kiln load. If they
have a low AL203 issue or some other chemically
challenging problem, some will be happy to turn bright
pink to go with the reds you are after. I might add
this is not inclusive or obtained just from a chrome
tin red glaze. Any chromium glaze is subject to adding
pinking to some tin whites in a kiln. I don't have the
problem but I do know how to make it happen and even
wrote a glaze called pink bloomers (LAFFFF) that
looked like a pair of drawers washed with a new bright
red but fading shirt. It started out as a joke for
some classes but some of the students decided they
wanted to use this pinking glaze for decorative items.
Now we have one running around with Pink Bloomers on!
What a shame and I hate to take credit.
Bill Edwards
=====
http://www.tallapoosariverpottery.com/
Bill Edwards
PO Box 267
Lafayette, AL, 36862
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