Ryan_pelo Posted November 15, 2016 Report Share Posted November 15, 2016 In my high school ceramics class, CAM 17 metals are banned by my school district because it's not environmentally friendly. This limits our current glazes to just a few dull colors and white. I am experimenting with glazes right now but I have yet to find a cone 6 oxidation recipe for any purples, blues, greens, yellows, oranges, or vibrant reds. Does anyone know of any recipes that can produce those colors without using any CAM 17 metals? Link to comment Share on other sites More sharing options...
neilestrick Posted November 15, 2016 Report Share Posted November 15, 2016 Well, that's an overreaction, and kind of ridiculous if they use electricity in the school produced by anything other than solar or wind power. The amount of metals released into the air by the coal burning power plant during the production of electricity to run the kiln is probably more hazardous than the metals that might get into the waste stream from glazing pots. I get their point, but come on already. Glazes with those materials can be certified non toxic, meaning you can ingest them without dying, so by the time they get into the environment they would be so diluted as to be a non-issue. Have you talked to them about ways to minimize the glazes getting into the waste stream? For instance, instead of using the sink you can use buckets of water to rinse brushes and sponges, and when the glaze materials settle out in the water they can be collected and fired into glass that can be safely disposed of. Or you can take all that glaze material and add some kaolin to it to stiffen it up and actually use it on non-functional work. The amount of glaze that would get into the environment would be tiny. Which metals, specifically, are banned? Link to comment Share on other sites More sharing options...
Mark C. Posted November 15, 2016 Report Share Posted November 15, 2016 No chrome ,copper or cobalt -well thats just downright nuts There are many ways to keep them contained-in use and afterwards as Neil says. My guess is you are in my state which is California and in a So-cal school district???? Admin or teacher , an overreaction either way. You can work with iron for reds if they allow iron oxides? Link to comment Share on other sites More sharing options...
preeta Posted November 16, 2016 Report Share Posted November 16, 2016 wow! the WHOLE school district? do they do the same for painting classes too? no cadmium reds allowed? wont surprise me if they do this and clean with bleach. Link to comment Share on other sites More sharing options...
Guest JBaymore Posted November 16, 2016 Report Share Posted November 16, 2016 Well, that's an overreaction, and kind of ridiculous................ Amen to that. Are all the school buses electric and charged from solar cells .... that somehow itself was manufactured without using any energy that was non "green"? An d used materials that are non-polluting in the fabrication of those cells? (And so o, ...and so on....and so on.......) I call this level of absurdity... "greenwashing". best, ...............john Link to comment Share on other sites More sharing options...
LeeU Posted November 16, 2016 Report Share Posted November 16, 2016 The fall-out from policies like that one is once they get into a bureaucratic system they tend to grow roots and become entrenched forever, with very poor odds of getting anyone in authority to make a reasonable adjustment based on the facts, and they also promulgate a transmission of "bad data" to students who will carry forth the misinformation until who-knows-when! Link to comment Share on other sites More sharing options...
Ryan_pelo Posted November 16, 2016 Author Report Share Posted November 16, 2016 Yes, I am in a California school district in the Bay Area. They don't want any of the metals getting into the water system. I can use yellow, red, and black iron oxide, rutile, titanium dioxide, tin oxide, and several others I can't bother to name. The disallowed metals include cobalt, copper, chromium, vanadium, Nickel, barium, zinc, and lead. This also rules out any mason stains. Is there any substitute colorant that could produce anything on the blue or green spectrum? Link to comment Share on other sites More sharing options...
neilestrick Posted November 16, 2016 Report Share Posted November 16, 2016 You can get iron greens pretty easily. They tend to go toward the olive side of green, but they can be quite nice. Add iron to some clear bases and se what you get. You can also get iron to go yellowish, but in an earthy way, sort of mustard. Blue is more difficult. In reduction you could get a celadon blue, but I'm not sure how to get it in oxidation without cobalt. You can get oranges and yellows with the rutile and tin. Iron reds, browns, and blacks. It's definitely going to be an earthy pallet, nothing too bright. Ask them about using wash buckets and such. It really is ridiculous. Link to comment Share on other sites More sharing options...
SydneyGee Posted November 16, 2016 Report Share Posted November 16, 2016 http://glazy.org/search?search_words=rutile&category=36&subcategory=0&cone=0&atmosphere=0&surface=0&transparency=0&color=Try searching recipes on glazy and cross checking if ingredients can be subbed out or in! Link to comment Share on other sites More sharing options...
Ryan_pelo Posted November 18, 2016 Author Report Share Posted November 18, 2016 Just as an update, I found a few bright pastel colors that can be made without the disallowed metals. Neodymium oxide can produce light blues in oxidation, erbium oxide can make light pinks in oxidation, and praseodymium oxide can make lime greens in oxidation. One drawback is that they are expensive, but I'm glad to have found a solution Link to comment Share on other sites More sharing options...
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