Japan Woodworker K-1 - Green Rouge Polishing Compound | Woodcraft
ALOX-5 PLATINUM POLISHING WHITE COMPOUND JEWELERS POLISH BAR LARGE KOYO JAPAN | eBay
Koyo Blue Label Polishing Compound – Cutting Edge Knives
SharpEdge - Japanese Kitchen Knives - You will find a block of Koyo "Green Rouge" polishing compound in practically every knife smithery in Japan (and also in other tool-making facilities). Blacksmiths apply