CLN studios Posted October 2, 2014 Report Share Posted October 2, 2014 I have a simple recipe for an oxide wash that comes out as a bronze/gold at ^6 Magnesium Dioxide 80 Copper Carbonate 20 This oxide is supposed to be applied very thick. Ive seen that Magnesium and Copper are very hazardous in their powdered states, this will be for decorative items mostly. Will this still be poisonous just bare without a clear glaze. Link to comment Share on other sites More sharing options...
Min Posted October 2, 2014 Report Share Posted October 2, 2014 That would be manganese dioxide not magnesium in the recipe. Nasty "glaze", no way should it be used on anything that could even possibly be used on functional items. If you do use this then make sure your kiln is really well vented, fumes from firing manganese are very unhealthy and there is a heck of a lot of it in this recipe. No way this even comes close to being a stable glaze, clear cover glaze overtop or not. Link to comment Share on other sites More sharing options...
Guest JBaymore Posted October 2, 2014 Report Share Posted October 2, 2014 This is in no WAY a "glaze". DOn;t even begin to thisk of it that way. There is no glass former (SiO2 or B2O3) even present there at all. Any glassing is casued by the fluxes CuO and MnO2 "stealing" a bit of silica (SiO2) from the surface of the clay body itself. The resulting surface is a hugely metallic oxide oversaturated unstable "glass" (in the loosest definition of the term) that will be both highly colorful and highly metallic oxide leachable. Under NO circunstances would this be good for food or liquid drink surface. Even covering this with a glaze of some sort is HIGHLY suspect for leaching. The dust from that mixture (when dry) is not good to for the potter to breathe either. best, ......................john Link to comment Share on other sites More sharing options...
CLN studios Posted October 3, 2014 Author Report Share Posted October 3, 2014 Thanks, yeah i realise its not a glaze with only 2 ingredients in the mix So i understand that this will leach like no ones business. but will there be enough to harm you just from picking it up and handling? Link to comment Share on other sites More sharing options...
Guest JBaymore Posted October 3, 2014 Report Share Posted October 3, 2014 Pick up and handling.... nope. best, ...................john Link to comment Share on other sites More sharing options...
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