Three rounded glass bottles with cork stoppers filled with unidentified colored powders in green, purple, and orange. One bottle of sulphanthrene pink F.F., a fast-vat dye manufactured by the E.I. du Pont de Nemours & Co.
Science History Institute. Unidentified Colored Powders. Photograph, 2022. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/hpnnque.
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