#546. Ink, Indestructible

- By Formula pot


  • Refer procedure


On many occasions it is of importance to employ an ink indestructible by any process, that will not equally destroy the material on which it is applied. For black ink, twenty-five grains of copal, in powder, are to be dissolved in two hundred grains of oil of lavender, by the assistance of a gentle heat, and are then to be mixed with two and a half grains of lampblack and half a grain of indigo. This ink is particularly useful for labelling phials, &c., containing chemical, substances of a corrosive nature.