Electric Mid&Hi Fired Ceramics
Potters & Sculptors - Making Rock from Mud
Nickel Carbonate 10%, Ferro Frit 5301 100%, Xanthan Gum 3%, ^06
The look of 10% nickel carbonate in a high expansion Ferro Frit 5301. Using Ferro Frit 3269 the green crystallization is less widespread, typically where the glaze pools.
I'm adding EPK and other ingredients to replicate this glaze for ^6.
Comment
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Comment by Norm Stuart on April 9, 2013 at 3:58pm
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Off the top of my head I added 10% EPK, which doesn't seem at all sensible now.
Upon reflection it seems I should add only 20% to 25% Silica to make it more refractory, with a Silica/Alumina ratio similar to other glossy high fire glazes.
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What I meant was how much of what are you adding to the recipe before you take it up to ^6? I could try some variations as well to see what we can come up with. Jeff
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I'm trying a ^6 without slow-cool tomorrow.
There are samples of the 100% 5301 and 20% Iron Oxide, with pancakes underneath, as well as the same with added Kaolin or Kaolin and Silica. I don't know enough not to try it.
The tile below is fired to ^06. The Glaze is 100% Ferro Frit 3269, 20% Spanish Iron Oxide, with 16% Cryolite added to bring the Fluorine up to the 9% level found in the 5301 frit. With the Cryolite added I get Aventurine.
Clearly Fluorine is an important ingredient for a nice Aventurine glaze, likely as a flux but who knows what else it contributes? I previously tried recipes without Fluorine, like the ones below the photo, which result in a more opaque Aventurine glaze which splatters in the kiln which is not anyone's idea of a good glaze.
Ugly Muddy Kiln Splatter Aventurines (too thick and they're matte brown)
http://lindaarbuckle.com/handouts/glz_hg_lowfire.txt 124.0% Aventurine ^04 75.0% Gerstley Borate 25.0% Silica, Imsil A-25 24.0% Red Iron Oxide 105.6% Aventurine ^04 John W Conrad 39.7% Silica 38.8% Borax 15.2% Red Iron Oxide 7.0% China Clay 2.7% Boric Acid 2.2% Barium Carbonate
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How hard is that going to be to take it up to ^6? Would you be able to do that with the Iron Aventurine as well?
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Hey Norm,
That's a cool looking glaze! 5301 does some nice things. I still haven't gotten around to making the aventurine with the Special RIO. Maybe this weekend!
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