Patent ID: 8808060

Claim:
A method of sharpening blades of a hair cutting device, comprising: providing a sharpening composition including a plurality of crystals, each crystal having an exterior surface area and an interior, the interior having a natural color, the exterior surface area dyed a color different from the natural interior color of the crystals; activating a hair cutting device; prior to or after activating the hair cutting device, submerging a working end of the hair cutting device at least partially into the sharpening composition, wherein with the working end of the hair cutting device at least partially submerged within the sharpening composition and the hair cutting device activated, blades of the hair cutting device are sharpened by crushing the crystals of the sharpening composition into a substantially powder form, wherein crushing the crystals exposes the interiors of the crystals; viewing the sharpening composition during sharpening; and determining that sharpening is complete when a color of the sharpening composition is substantially changed from the dyed color to a color of a lighter shade due to the fact that the interiors of the crystals, which have the natural color, are exposed.