Bill Edwards on sun 9 mar 03
Theres several points here regarding CTR. I have
worked with this crazy color for many years and have
developed several good recipes for it as well as
countless flops. What I can offer. The loss of color
as in LOI and the gaining of it where Tin Oxide
colorants are used on other pots is subject to this
mostly where AL203 is low and calcium is high. I have
fired hundreds of loads over the years with my Chrome
Tin glaze in with many other pots including stark
white and these did not pink. On the other hand I have
a formulation I wrote that was done so purposely to
turn as pink as a baby pig and close to red where
chromium was set next to it. Is it durable? Have it
tested. I use it for decoration but it passed the
lemon slice test. Hasn't crazed on B-Mix and several
other stonewares that I can find. But its red and with
that it has special considerations. Keep in mind that
I do advocate testing FSIS/FDA on products where
acidics or food stuff may be used and in cookware. My
commercial stoneware products are tested via FSIS/FDA
approved lab and information derived from that process
alone has been invaluable. It paints a picture for me
so I can push the limits in developing. I write at
lest 5 new recipes a week and test them, if the color
excites me and shows stable via my calculations,
nothing makes me any happier than to see a return lab
report with good marks!
Here is a good one to try but I can't put enough
emphasis on glaze travel. You need to match as close
as possible the materials that I use and also the
firing. The firing for this red is rather simple. No
special ramping, using an automated controller. Cone 6
oxidation. Med speed, no hold. Cone ^6 turn off
envirovent if you run one once it drops below 1000F
and allow to cool to touch. Place several cones
throughout the kiln to insure your hitting a good 6. I
have fired below and above 6 and had good results.
This glaze is workable from ^4 - ^8 but you are
getting to a very fluid phase at that point. ^4
underdeveloped but red or maroon.
Edwards Chrome Tin (November version) ^6 2194F
Nepth Syen (Blue Mountain) - 25.00
Wollastonite - 20.00
Ferro 3134 - 15.00
EPK - 15.00
Silica - 20.00
Talc - 5.00
((colorants))
0.30% Chromium Oxide green
6.00% Tin Oxide
Ababi I don't know if you have used this one. Try it
on porcelain or lighter burning clay bodies for
optimal saturation of color.
*Hint - Most any CTR will do better if mixed and
sieved several times and allowed a setting period of
at least a week. This one ages well but run a test
tile right after mixing and do the same upon each
firing to get a feel for how this glaze can get
brighter after some bucket time and also this helps
you learn a proper thickness which helps if you intend
on staying with CTR's for any time. Dip once on part
of it and double dip another portion so you can get
the feel for it.
I will be more than happy to supply a clear digital
shot of this glaze upon request. Please let me know!
Now who wants to offer up some turquoise glazes for ^6
Oxidation? Glossy or matt. Anything new!
William Edwards
=====
http://www.tallapoosariverpottery.com/
Bill Edwards
PO Box 267
Lafayette, AL, 36862
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Ababi on sun 9 mar 03
Yes I think I had tried it was fine, not a celebration.
I tested some of mine too some "grids" and some line blends.
I think the one here was the best ( To my test)
ABABI WOLLASTONITE BASE MAUVE
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1222 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
kaolin CC31 20.00
Wollastonite 34.00
Feldspar Soda F7 32.00
frit A 2120 7.00
kaolin CC31 calcined 7.00
Tin Oxide 7.00
Chrome Oxide 3.50
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.247 6.25%
CaO 0.716 15.56%
MgO 0.037 0.58%
BaO 0.000 0.02%
Al2O3 0.436 17.23%
SiO2 2.589 60.32%
TiO2 0.001 0.03%
K2O 0.026 0.96%
Na2O 0.220 5.30%
Al:Si 5.93
Expan. 8.10
ST 378.27
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
The nearest to your materials will be
ABABI WOLLASTONITE BASE MAUVE W
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1222 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Custer feldspar 53.80
OM-4 Ball Clay 20.20
Dolomite 0.70
Calcium Carbonate 17.60
Wollastonite 7.60
Tin Oxide 7.00
Chrome Oxide 3.50
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.259 8.29%
CaO 0.718 15.25%
MgO 0.024 0.36%
Al2O3 0.436 16.85%
SiO2 2.590 58.97%
TiO2 0.009 0.27%
K2O 0.182 6.48%
Na2O 0.077 1.81%
Al:Si 5.93
Expan. 8.23
ST 376.65
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Tomorrow I will make me some. The poor children must finish first ( happily) the
leftovers from the tests.
Turquoise on Tuesday
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
Ron Hollister on mon 10 mar 03
Following is a cone 6 oxidation chrome red that goes reddish purple =
where thicker. I've used this glaze for about two years with good =
results and without any cross over problems in the kiln. As for =
application, if it's to thin it will be white or a light pink, if it's =
really thick it may come off the pot. Small pieces I usually dip for 3 =
to 4 seconds, larger pieces I spray where I can control the thickness =
for better results.
Ron Hollister
CT Red ^6 Oxidation
EPK 808
Flint 3232
Gerstley Borate 2121
Nephelene Syenite 1717
Talc 101
Whiting 2020
Chrome Oxide 15
Tin Oxide 505
http://www.ronhollisterpottery.com/Chrome_Tin_Red
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