While the perspiration from most of the body is acid, that from the armpits is alkaline. For treating colors changed by this, see "alkali," page 288. The yellow stains sometimes caused upon white material by perspiration are removed by the following agents:

1. Soap and water. Exposure to the sun helps to bleach the stained material.

2. Javelle water.

3. Potassium permanganate. Pitch.

See "resinous substances," below.