Lotions for Ringworm

Sulphate of zinc, two scruples; sugar of lead, fifteen grains; water, six ounces. Wash the parts two or three times a day.

Or: paint the rings with black writing ink.

Tincture of iodine, applied with a feather, is considered to be a speedy cure.

Another good remedy is two drams of muriated tincture of steel (steel drops) mixed with four tablespoonfuls of soft water. Bathe with it night and morning, and let a little of the lotion dry on.

Source: Recipes for the Million

To Take Rust from Steel Implements or Knives

Rub them well with kerosene oil, leaving them covered with it a day or so; then rub them hard and well with finely powdered unslaked lime.

Source: The White House Cookbook, F.L. Gillette