Gonen Posted December 15, 2022 Report Share Posted December 15, 2022 hi everyone dose anyone know in what way dose black clay ( a stoneware ) different chemically from regular white clay ? is it just "dirty" clay with more iron\cupper ? would be more than happy to read about it if you have a link thanks Quote Link to comment Share on other sites More sharing options...
Hulk Posted December 15, 2022 Report Share Posted December 15, 2022 Hi Gonen, Welcome to the Forum! Generally, contains manganese and iron, sometimes a stain (which likely has manganese in it)*, perhaps iron chromite (likely a rarity these days). Per my experience (one twenty-five pound bag), be prepared for a few cycles of testing. Stay well clear of any fumes whilst firing. Tony Hansen's article on manganese and clays: Manganese in Clay Bodies (digitalfire.com) A forum thread on black clays: Black Clay Advice - Clay and Glaze Chemistry - Ceramic Arts Daily Community More links:clayart - thread 'black clay safety inquiry' (potters.org)clayart - thread 'black clay' (potters.org) *credit Min, here: Scarva Professional Black Clay bodies - Clay and Glaze Chemistry - Ceramic Arts Daily Community Gonen and PeterH 2 Quote Link to comment Share on other sites More sharing options...
Min Posted December 15, 2022 Report Share Posted December 15, 2022 (edited) @Joseph Fireborn was interested in what gave the Black Ice Porcelain from Sio-2 Clay its black colour. From this thread he was told by the manufacturer it is stain plus oxides but not including manganese. SDS for Black Ice Porcelain doesn't give any clues. Edited December 15, 2022 by Min added SDS Joseph Fireborn, Hulk and Rae Reich 3 Quote Link to comment Share on other sites More sharing options...
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