DebiBeck@aol.com on sun 17 mar 96
Brian, Try Manganese Dioxide. I have found it works good in combination
with cobalt oxide.
seedyrom@onramp.net on tue 2 apr 96
here's where I got the recipe....
AND when I went back to get the original post, I came across my notes
concerning the cobalt carbonate. It's 3.3% not 1.75%.
Peggy
> Date: Tue, 27 Feb 1996 06:59:10 EST
> Reply-to: Ceramic Arts Discussion List
> From: Autumn Downey
> Subject: Re: In search of purple
> To: Multiple recipients of list CLAYART
> ----------------------------Original message----------------------------
> Magnesium in a glaze will turn cobalt purple - You could probably try adding
> talc 10 - 20% and increments of cobalt oxide from .5% to 2%
>
> 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
> FORMULA & ANALYSIS
> ~~~~~~~~~~~~~~~~~~
> *CaO .30 5.95%
> *MgO .43 6.19%
> *K2O .12 4.05%
> *Na2O .05 1.21%
> *ZnO .10 2.91%
> *Fe2O3 .00 .10%
> B2O3 .28 6.96%
> Al2O3 .24 8.83%
> SiO2 2.96 63.79%
>
> COST/KG .31
> RATIO 12.28
> EXPAN 6.14
> WEIGHT 278.75
>
> Good luck - purple and lilac sound very Eastery and springlike, which it is
> NOT, here in Yellowknife, NWT.
>
> Autumn Downey
> downeya@internorth.com
>
>
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