The blue-green tarnish on copper, brass, and bronze, consisting of basic copper carbonate, is known commonly as verdigris. In removing it from textiles use the following agents:

1. Soap and water (ordinary laundering). Stains that are merely on the surface of the material can sometimes be removed in this way.

2. Dilute acids, such as vinegar, or lemon juice. Apply one of these to the stain and rinse off as soon as it has dissolved the verdigris.