Mike MacMahon on fri 21 mar 97
Prospective potters in N.H. high school pottery studio, are desperately
seeking a safe ^6 'true' purple/violet glaze recipe. Any help ou there?
Thanks in advance.
Mascenic potters
June Perry on sat 22 mar 97
Dear Mike:
Take a high magnesia glaze and add one to two per cent colbalt to get purple.
You may try adding some tin oxide to one of the tests as well. Cobalt and tin
in a high magnesia glaze can give pink/lavendar tones.
Good luck.
June
LYN PEELLE on sat 22 mar 97
Here's a ^6 Ox m semi matt Eggplant glaze
Soda fledspar 45.7
Siclica 15.2
Talc 12.7
Gers Borate 12.9
Dolomite 9.0
EPK 4.5
Bentonite 1.0
Cobalt carb 2.0
Mang carb 5.0
I subbed 3.8 Mang diox for the Mang carb with
good results. Seems to fire ok in the 64-6 r errr
^4-^6 range.
Lyn
Greg Lamont on sat 22 mar 97
At 07:07 AM 3/21/97 EST, you wrote:
>----------------------------Original message----------------------------
>Prospective potters in N.H. high school pottery studio, are desperately
>seeking a safe ^6 'true' purple/violet glaze recipe. Any help ou there?
>Thanks in advance.
>
>Mascenic potters
>
Mike/Mascenic Potters:
Here's a recipe for Eggplant Purple. I've had excellent success with this
glaze. By itself it's a satin-matt medium purple, but it's even more
interesting used over or under a chrome/tin burgundy glaze.
Eggplant Purple -- ^6 oxidation
Kona F-4 feldspar 45.7 g.
Flint 15.2
Talc 12.7
Gerstley Borate 12.9
Dolomite 9.0
EPK 4.5
add:
Bentonite 1.0
Cobalt Carb. 2.0
Manganese Carb. 5.0
Good Luck,
Greg
SolvejgMa@aol.com on sat 22 mar 97
Hi Mike -
This is one I've been playing with lately, cone 6 - 7.
Lavender Satin - oxidation , ^ 6 - 7
Flint 29.6
Gerstley B. 21.1
Neph Sy 12.3
Cobalt Carb 2 %
Works good over carvings. Have fun!
jpyle@hs.gettysburg.edu on sun 23 mar 97
I've saved some formulae for purple glazes, and am forwarding them to you.
My (high school) students like Pike's Oatmeal a lot. I don't know if the
others are the same with different names; I haven't compared them, just
filed them.
Judy Pyle
Gettysburg, PA
You asked for a purple glaze. Here's one that I've finally gotten
to test and it may be what you are looking for. I got it from a
community studio where my dad hangs out and I have no idea where
they got it from. I think they called it Deep Purple.
Deep Purple, electric cone 6
Gerstley borate 8.4
Nepheline syenite 14
Custer (potash) feldspar 27
Whiting 12
Lithium carbonate 3.7
Magnesium carbonate 1.7 (lite, the white fluffy stuff)
Flint 33
Bentonite 2
Tin oxide 5
Cobalt carbonate 0.6
Chrome oxide 0.17
Some of the numbers may seem a bit funny but I've proofread this!
It was converted first from a batch recipe and then HyperGlaze keeps
all these decimal points. Some of them probably matter when scaling
back up again.
I think it is important to use these exact ingredients and not to
try for substitutions. I tried calculating an equivalent and one
of the glaze gurus on the list also did a recalculation different
from mine. Both of our tries came out a sort of greyed blue that
isn't terribly attractive. When I finally got the original
ingredients and fired the test side by side with the others, this
one came out purple and the others were blue. But so far I've
only done one test with this glaze and don't know whether it is
reproducible under normal firing (this last firing was, um, one
of those learning experiences.)
You'll also find Brian Kemp's purple in the GlazeBase I think.
I never got around to testing that one.
Have fun,
Jan Walker
Cambridge MA USA
----------------------------Original message----------------------------
Here is a nice purple glaze that was posted on clayart not too long ago.
Egg Plant Semigloss
Soda Feldspar 46
Flint 15
Talc 13
Gerstly Borate 13
Dolomite 9
Epk 4.5
Bentonite 1
Colbalt Carb. 2
Manganese Carb. 5
It is an extreemly nice glaze. Give it a few tests first though. It is a
lighter
Good Luck!
Rebecca Huston
>Our Guild has a cone 6 recipe (originally from Connie Pike) which turns very
>purple if you add 2% cobalt oxide to it. You might try adapting it for
>higher temperatures.
>
> Pike's Oatmeal
> ~~~~~~~~~~~~~~
> CUSTER FELDSPAR... 2238.00 37.34%
> COLEMANITE........ 762.00 12.71%
> DOLOMITE.......... 384.00 6.41%
> TALC.............. 816.00 13.61%
> KAOLIN............ 270.00 4.50%
> FLINT............. 1362.00 22.72%
> ZINC OXIDE........ 162.00 2.70%
> ====================
> 5994.00
Ron Roy on tue 25 mar 97
>>Prospective potters in N.H. high school pottery studio, are desperately
>>seeking a safe ^6 'true' purple/violet glaze recipe. Any help ou there?
>>Thanks in advance.
>Here's a recipe for Eggplant Purple. I've had excellent success with this
>glaze. By itself it's a satin-matt medium purple, but it's even more
>interesting used over or under a chrome/tin burgundy glaze.
>
>Eggplant Purple -- ^6 oxidation
>
>Kona F-4 feldspar 45.7 g.
>Flint 15.2
>Talc 12.7
>Gerstley Borate 12.9
>Dolomite 9.0
>EPK 4.5
>
>add:
>Bentonite 1.0
>Cobalt Carb. 2.0
>Manganese Carb. 5.0
If it's really a safe glaze you are looking for this ain't it. It's over
supplied with MgO and MnO2 and short of silica for cone 6.
My reference says anything over 4% MnO2 in a glaze will precipitate out on
the surface.
Ron Roy
Toronto, Canada
Evenings, call 416 439 2621
Fax, 416 438 7849
Margaret Arial on wed 26 mar 97
Greg,
How are you getting a chrome tin burgandy?
Greg Lamont on sun 30 mar 97
At 08:43 AM 3/26/97 EST, you wrote:
>----------------------------Original message----------------------------
>Greg,
>How are you getting a chrome tin burgandy?
>
I use a recipe from Richard Burkett, "Chrome/Tin Pink", although in my
experience, it's a deep burgundy rather than pink. It's a nice gloss glaze,
best over a white body. Experiment using it over and under the Eggplant
Purple. I've had great results. Also very nice used over/under the
Weathered Bronze Green variant of Pete's Strontium Matt glaze.
Here's the recipe. Happy testing!
Greg
gdlamont@iastate.edu
Gerstley borate 20.68 %
Neph Sy 16.29
EPK 11.34
Whiting 19.52
Flint 32.16
-----------
100.00
add:
Green chrome oxide 0.15 %
Tin oxide 5.00
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