clay lover Posted May 4, 2015 Report Share Posted May 4, 2015 I am working on finding a base glaze that has a satin finish that I can use different oxides with to get different glazes. Do some oxides flux a glaze more that others? All my attempts at blue are coming out shiny. Does the iron in dark red and brown clays flux glazes that are used over them? Link to comment Share on other sites More sharing options...
High Bridge Pottery Posted May 4, 2015 Report Share Posted May 4, 2015 I was reading a bit about iron yesterday. It seems it can act refractory in low alumina glazes but also act as a flux in low flux glazes. I would think that each oxide acts differently in a glaze. "Chemically, iron is amphoteric like alumina. Fe2O3 generally behaves as a refractory antiflux material in a glaze melt, combining with alkalis. Oxidation iron-red glazes, for example, can have very low alumina contents yet do not run off ware because the iron acts like alumina to stabilize and stiffen the melt. However these glazes likely will have somewhat reduced durability. -In glazes low in flux it can behave as an alkali, combining with silica" Link to comment Share on other sites More sharing options...
oldlady Posted May 5, 2015 Report Share Posted May 5, 2015 if you work at cone 6, try some of the Wettlaufer glazes in his book "getting into pots" from the 1970s. he lists maybe 6 glazes, some shiny, some matte and one described as waxy. i found that one to be an excellent purple with the addition of Pansy purple mason stain. have tried several other stains in it and they worked well. Link to comment Share on other sites More sharing options...
Bob Coyle Posted May 6, 2015 Report Share Posted May 6, 2015 I have a nice semi matte (satin) base glaze I use with 0.5 % cobalt carb. When I tried it with 3% copper carb it goes more matte. with 3% RIO it becomes shiny. RIO can be a flux at cone 6 temperatures. Probably the semi matte glazes I formulate are right on the edge anyway. It's a lot harder to get a stable satin than a shiny glaze. If you are on the edge then any additive will probably change the surface texture. Link to comment Share on other sites More sharing options...
Mark C. Posted May 12, 2015 Report Share Posted May 12, 2015 colorants do affect the flux and a satin matt is a are glaze to begin with. You just have to test test test. Mark Link to comment Share on other sites More sharing options...
clay lover Posted May 12, 2015 Author Report Share Posted May 12, 2015 I know, I know, I know Link to comment Share on other sites More sharing options...
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