Boats Posted March 11, 2014 Report Share Posted March 11, 2014 Has anyone attempted to use natural iron pyrite in a clear base glaze to a mid to high fire on stoneware? I would like to use iron pyrite collected directly from area streams which may contain minute amounts of gold or silver. I would like to avoid having to completely reinvent the wheel. I have a propane updraft kiln. Any advice or educated guesses are welcome. Link to comment Share on other sites More sharing options...
Tyler Miller Posted March 11, 2014 Report Share Posted March 11, 2014 Unfortunately pyrite isn't chemically stable at kiln temps, and its by-products are some nasty things (Hydrogen sulphide, sulphur dioxide, sulphuric acid). When roasted it forms a less stable Iron sulphide which can ignite in air. If you were to process it to be a usable ceramic material, you'd have some form of iron oxide. I personally wouldn't bother with it. It's a lot of semi-dangerous work for one of the cheapest pigments out there. Link to comment Share on other sites More sharing options...
neilestrick Posted March 11, 2014 Report Share Posted March 11, 2014 http://digitalfire.com/4sight/material/iron_pyrite_1156.html It can be used for speckling in glazes according to the above information. http://www.potters.org/subject23714.htm Link to comment Share on other sites More sharing options...
Guest JBaymore Posted March 11, 2014 Report Share Posted March 11, 2014 The sulphur produced will likely be problematic. Is local material usage worth the issues? Only you can decide. best, ..............john Link to comment Share on other sites More sharing options...
Boats Posted March 11, 2014 Author Report Share Posted March 11, 2014 Thanks for the info. This will certainly save me a great deal of headache. This alone paid for my membership fee, and then some. Link to comment Share on other sites More sharing options...
Marcia Selsor Posted March 11, 2014 Report Share Posted March 11, 2014 Gold is a colorant for ruby red glass. it may not give you gold flecks if that is the desired outcome. Silver may turn black. And yes sulphur can be a big problem. marcia Link to comment Share on other sites More sharing options...
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