Yellow Italian polishing powder.
205X Marble Polishing Powder is a blend of high quality Italian polishing materials. The solid form of this powder is the most popular polishing media used in Italian Marble Factories. Commonly referred to as "5X Powder", 205X is a very effective way to polish all Marbles, Limestone, Terrazzo and other calcium-containing stone.
205X is also a great polishing method for properly honed concrete.