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Rolange

Red Clay And Manganese Dioxide...

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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.

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Guest JBaymore

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

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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

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