Rottenstone. Decomposed limestone in a soft powdery form used as a polishing compound. From light gray to olive color it has light cutting power used for both metal and wood. Rottenstone is particularly useful for removing lead disease. See buffing and polishing.
excerpted with permission from
For Artists, Makers, Collectors and Curators
COMPILED AND WRITTEN BY D. WAYNE JOHNSON
Roger W. Burdette, Editor