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  1. Hi all, I've been using Standard 266 which has manganese dioxide. However, I can't seems to find the limits of safety and what percent of Mn is in this clay. Can anyone help? I fire in a small community studio in a vented electric kiln. It seems the fumes are the most dangerous. If this is true, would it be wise to choose another clay body? *even though I love the 266 and so do my students! I'm new to posting, so I apologize if this has already been covered in past topics. Thanks
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