For razors you want pure Chrome Oxide, trusted brands are SRP, Kremer Pigments, Hand America or any from Razor manufactures, read the labels.

Hardware & Woodworking stores and polishing paste all contain other abrasives for aggressively polishing metal and will leave a harsh micro chipped edge.

Good razor quality Chrome Oxide, is not expensive and a one-time purchase is a lifetime supply, buy the good stuff.