Diz Posted September 5, 2016 Report Share Posted September 5, 2016 HI All, Trying to find a couple new glazes and am interested in a turquoise yellow salt glaze that I found in an old clayart topic from 2000 by Dr Tom Roess. I understand all the ingredients but it is the quantities of colorants that do not make sense to me. I know there are participants here that will be able to explain it to me. (Thanks for your help). Here is the recipe: TURQUOISE YELLOW SALT CONE 10 REDUCTIONNeph Sy 63.9Dolomite 21.1Ultrox 16 (use superpax)OM 4 clay 4.3Bentonite 4Also add1/8 =25 Cobalt Carb2 =25 Copper CarbTo 10,000 grams add 1/2 C. Muriatic Acid My question pertains to the amounts of cobalt carb and also the copper carb. The amounts seem incredibly high -might the base recipe have been written for 105.3 plus 4 bentonite grams, and the colorant additions were listed for a 10,000 gram recipe? Is my guess anywhere close to explaining this. Would appreciate help with the correct colorant amounts - cobalt is too expensive to waste! I will be firing this in a gas kiln fired with LP, to cone 10 R - not a salt kiln Thanks for sharing your knowledge! Diz Link to comment Share on other sites More sharing options...
Mark C. Posted September 5, 2016 Report Share Posted September 5, 2016 I have a few of these recipes I can look up for you and give some guidance-It will be a day or two as i have some obligations tomorrow . I'll look into it. Mark Link to comment Share on other sites More sharing options...
High Bridge Pottery Posted September 5, 2016 Report Share Posted September 5, 2016 I think the =25 is some weird way that the % sign has converted/displayed/archived. So you just have 1/8% cobalt and 2% copper. This other recipe I found kinda backs that idea up except they are using 1/4 cobalt instead of 1/8. http://cindywennin.com/turquoise-yellow-salt-glaze/ Turquoise Yellow Salt GlazeCone 10 ReductionNepheline Syenite 63.9Dolomite 21.1Zircopax 16OM4 Ball Clay 4.3———————-105.3Add:4% Bentonite0.2% Cobalt Carb2.0% Copper Carb Link to comment Share on other sites More sharing options...
JohnnyK Posted September 5, 2016 Report Share Posted September 5, 2016 I'm curious about what the HCl does in the recipe and whay it called for 1/2 cup in 10Kg if you are only mixing 100g... Link to comment Share on other sites More sharing options...
PeterH Posted September 5, 2016 Report Share Posted September 5, 2016 Joel Edmondson: I think the =25 is some weird way that the % sign has converted/displayed/archived. Nice spot, 25 is the hexadecimal HTML code for the % character. http://www.ascii.cl/htmlcodes.htm JohnnyK: I'm curious about what the HCl does in the recipe and whay it called for 1/2 cup in 10Kg if you are only mixing 100g... I suspect that the HCl is mitigating the deflocculant effects of solubles from the neph sy. I think that the recipe was an attempt at a scale-free one (i.e. in %) that drifted a little to total 105.3 Link to comment Share on other sites More sharing options...
Diz Posted September 5, 2016 Author Report Share Posted September 5, 2016 I knew I could find help here! Thanks again. And Mark - I'm glad to wait for more info, - never enough in my book. Link to comment Share on other sites More sharing options...
Mark C. Posted September 7, 2016 Report Share Posted September 7, 2016 Today was glaze making day-I checked all my altered yellow and yellow salt recipes and they are all Iron based but the %s are all around 1% (iron is strong) so my guess is yours is just fine. Good luck and let us know what turns out. Link to comment Share on other sites More sharing options...
oceancity Posted September 7, 2016 Report Share Posted September 7, 2016 Would love to see some pictures of how this glaze looks!! If you have any please post...or let us know how that recipe works for you. Link to comment Share on other sites More sharing options...
Diz Posted September 13, 2016 Author Report Share Posted September 13, 2016 My test sample turned out as I hoped, a soft semi matt yellow/gold with speckled iron showing thru. The color I was hoping for but my small bowl is ugly so I am t proud to show it here - will also have to figure out how to post pictures. I have a larger batch mixed and hope to glaze and fire on the weekend and then will post a picture. That was my success in the kiln - and luckily partly because I got what I was hoping for. Dumbest thing I've done lately ....6 identical small bowls with new test glazes fired in the kiln. I marked each with a number on the bottom...with wax..then fired...wax burned off ..glazes matured...2 successes..4 failures. Now which of the 5 remaining glaze tests is the other glaze success? So I have 5 more tests to put into my next firing. I love clay!! Link to comment Share on other sites More sharing options...
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