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=Bismuth.= The bismuth salts are not poisonous, but may contain arsenic as an impurity, although this is far less common than it was some years ago. =Chromic Acid, Chromate, Bichromate of Potassium.= These act as corrosives when solid or in concentrated liquid forms. In dilute solutions they act as irritants. Used as dyes; have proved fatal more than once.
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