Indestructible ink

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Indestructible Ink ink indestructible by the action of corrosive substances, and will not equally destroy the material on which it is applied.

For black ink, 25 g of copal in powder, are to be dissolved in 200 g of oil of lavender, by the assistance of a gentle heat, and are then to be mixed with 2 1/2 g of lampblack and 1/2 g of indigo

For red ink use 120 g of oil of lavender, 17 g of Copal, and 60 grains of vermilion. A little oil of lavender or of turpentine may be added if the ink be found too thick. A mixture of genuine asphalt(?) dissolved in oil of turpentine or benzene(?), amber varnish and lampblack, would be still superior.

This ink is particularly useful in labelling phials, etc. containing chemical or corrosive substances.

Source: Household Cyclopedia of 1881