Answer:
Rottenstone is a soft, finely powdered stone that is commonly used with oil for wood polishing. It is a type of abrasive material made of fossilized shells that have been ground into a powder. Rottenstone is relatively gentle compared to other abrasives, making it ideal for achieving a smooth and glossy finish on wood surfaces.
When mixed with oil, it creates a paste-like substance that is applied to the wood and then buffed to bring out the natural shine. Rottenstone is often used as a final step in the wood polishing process to bring about a lustrous and polished appearance.
Soft, finely powdered stone used with oil in wood polishing.