Coloring oil red.

Manufacturer and builder (11 / 1871)

[235] COLORING OIL RED. - The article used for coloring oils, alcohols, etc., red, is simply alkanet root, which you may get at any druggist's shop; one ounce of the root is sufficient for half a gallon of oil, if you let it stand for a few days in a warm place.

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