Sarah-Anne Posted March 6, 2018 Report Share Posted March 6, 2018 Hi everyone I am the tech at a small studio and introduced a Zakin clear (cone6) to them as a new clear glaze. They had been using Ron Meyers recipe and wanted something they could dip. It seem to be working just fine until a studio member put it over a slip colored with Raven Black mason stain. It changed from black to a rusty chocolate brown. Has anyone else run into this issue? Any advice or ideas would be great. Thanks! Slip recipe: Raven Black mason stain porcelain sodium sicate soda ash Zakin clear: Silica 18 kona F4 40 wollastonite 10 Gerstley borate 16 OM4 12 Zinc 4 Link to comment Share on other sites More sharing options...
Dick White Posted March 6, 2018 Report Share Posted March 6, 2018 Zinc is not your friend. First off, Raven Black is not a Mason stain, but rather is a Drakenfeld stain by Cerdec. However, the problem is the same. The oxides used to create the black are chrome and iron. Chrome and zinc = brown, not black. I can't find a document from Drakenfeld/Cerdec about the necessity to use a zinc-free glaze, but you might check the reference chart at http://www.masoncolor.com/reference-guide for comparable information. Link to comment Share on other sites More sharing options...
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