Polishing agent for amalgam
TIN OXIDE:
This extremely fine abrasive material is used extensively as a polishing agent for polishing teeth and metallic restorations such as dental amalgams in the mouth. It is mixed with water, alcohol or glycerin to form a mildly abrasive paste.
Phillips Science of Dental Material 12th Edition Page. 245-246.
Tin oxide
Iron oxide
Alumina
Silica