Manganese Red





Bisulphide of arsenic combines with basic metallic sulphides forming a

class of sulphur-salts, called by Berzelius, hyposulpharsenites. The

hyposulpharsenite of manganese is a dark red precipitate, uninjured by

sulphuretted hydrogen, and so far applicable as a pigment. Containing

arsenic, it would of course be poisonous; and would probably be found to

fade on exposure to air and light.





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