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| - U.S. Pat. No. 90,417 (Zengeler) discloses a dry powder ink containing dextrine, British gum, roasted starch, gum-arabic, or any other soluble gum or mucilaginous substance in combination with a mixture of aniline or any of its salts or compounds with oxidizing agents of any kind, such as chlorate or bichromate of potassa, sulfate, acetate, or chloride of copper, or the like.
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