A Simple and Harmless Hair Dye
“It is said that the water in which potatoes have been boiled with the skins on forms a speedy and harmless dye for the hair and eyebrows. The pareings of potatoes before cooking may be boiled by themselves, and the water strained off for use. To apply it the shoulders should be covered with cloths to protect the dress and a fine comb dipped in the water drawn through the hair, wetting it at each stroke, until the head is thoroughly soaked. Let the hair dry thoroughly before putting it up. If the result is not satisfactory the first time, repeat the wetting with a sponge, taking care not to discolor the skin of the brow and neck. No hesitation need be felt about trying this, for potato-water is a safe article used in the household in a variety of ways. It relieves chilblains if the feet are soaked in it while the water is hot, and is said to ease rheumatic gout.”
Source: The Housekeeper’s Friend: A Practical Cookbook