Directions to Dye the Hair

First wash the head, beard, or moustaches with soap and water; afterwards with clean water. Dry, and apply the gallic acid solution, with a clean brush. When it is almost dry, take a small tooth comb, and with a fine brush, put on the teeth of the comb a little of the silver solution, and comb it through the hair, when it will become a brilliant jet black. Wait a few hours; then wash the head again with clean water. If you want to make a brown dye, add double or treble the quantity of water to the silver solution, and you can obtain any shade of color you choose.

Source: Our Knowledge Box, ed. G. Blackie