The Miracle Workers: Rouge, Tin and Magic Potion

“Rouge” literally means red. Not so in the polishing business: it means fine abrasive. After sanding up to 600 (higher on darker stones) you may still want that deeper color and shine. “Rouge” may be the answer.

This is a block or stick in white, black, or green for light very dark, and green/gray stones. Use a muslin wheel on a drill or die grinder to pick up some of the rouges. Then rub it on the stone in a small area:  Pop – a colorful shiny finish. 
Tin Oxide powder is mixed with water to create a rubbing paste for a very high sheen (without toxic oxalic acid).