Rolange Posted March 30, 2017 Report Share Posted March 30, 2017 Hi there, I'm pretty new to glazing and looking for help. I've always been in love with Lucie ries work and have been trying to create a beautiful black glaze of hers made up of equal parts manganese dioxide and red clay. I'm not even sure you can call that a glaze which maybe why I'm having problems with running. The glaze looks beautiful but it runs! Is there anything I can do to stabilise the glaze while keeping the beautiful finish. I am firing it over earthstone original clay in an electric kiln to 1230. Up to 600 at 60/hr then at 100/hr up to 1230. Does anyone have any suggestions to help? I also wondered if anyone might know of a way of making this food safe? Can you layer a clear glaze over it? Appreciate your advice. Link to comment Share on other sites More sharing options...
Guest JBaymore Posted March 30, 2017 Report Share Posted March 30, 2017 Welcome to the forums. No way to make it "food safe". It is WAY far from a 'glaze". Call it a "surface" or a "patina". And to keep it from running it should go on THIN. Also research information on manganese fume issues from kilns. Serious stuff. best, ................john Link to comment Share on other sites More sharing options...
glazenerd Posted March 31, 2017 Report Share Posted March 31, 2017 Alumina Hydrate is the cure for runny glazes in general. 0.50-2.0% of batch weight pending how bad the flow is. However, as John pointed out: food safety is the higher priority. Red clay means iron content; so the manganese is reacting with the iron to produce black. To get black in crystalline: equal parts of red iron ox, manganese, and cobalt ox produces jet black. (3% each) However, I have not tested this formulation in traditional glazes. Nerd Link to comment Share on other sites More sharing options...
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