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Fixing a glaze that does not stay in suspension

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Fixing a glaze that does not suspend

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This was simple in INSIGHT.

First, it has no clay, there is no way it is going to stay in suspension. EPK is a great clay for glazes, it supplies alumina and silica. I put this glaze into INSIGHT and then duplicated it so I had two identical recipes side-by-side.

Then I killed the feldspar (it supplies silica, alumina and sodium). I then added Frit 3110 which is similar to feldspar but has almost no alumina. I tuned its amount to match the Na₂O up, then I added EPK and increased it until the Al₂O₃ matched. Then I increased the Silica to match the SiO₂ up.

This is the same process as is described in the lessons section of the INSIGHT manual. I got this. Fined tuning is still needed but you get the idea. You might try using ball clay instead of kaolin, minimum kaolin is usually about 15%. I was able to get 15% ball clay by dropping the bentonite and also using Frit 3110 to supply the K₂O and Na₂O instead of the feldspar. The key is that the changed recipe has the same chemistry but uses a different mix of ingredients to supply it. Try this recipe and let me know what happens.

Adjust the rutile to be the same percentage as the original and use the copper at the same percentage as well. I don't think this adds up to 100, so keep that in mind.

4.44 Whiting
5.56 Talc
29.89 Ferro Frit 3134
34.89 Silica #325
1.11 Bentonite
6.67 Rutile
17.00 Frit 3110
11.00 EP Kaolin

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Hi Tony, thanks for getting back to me, thisa is the recipe from Bill van Gilder that is settling out. I mixed a 10,000 gram batch:
Custer fekdspar 2200
Whiting 400
Talc 500
Ferro Frit 3134 2600
Silica #325 2600
Bentonite 100
Rutile 600
Copper carb 400

I mixed and seived with 80 mesh screen. After several dips it started acting strange, like it wasn't covering very heavily. It would be transparent sometimes and then in spots would be heavy enough to give abeautiful glaze. So I added about 1 1/2 teaspoons Gum solution. That helped some but I still must mix alot before using. I emailed Bill VG about this but never got an answer so I really appreciate You answering me. Restores my faith in man. I just might have to get this program of yours even if I dont understand it. If you have time I will send you the Pete Pinnell recipe also, he also didnt answer my questions, you might turn about to be the new glaze God.

Peggy Mahoney

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