Colored razor blades
View Patent ↗Colored razor blades are provided. Methods for manufacturing such blades are also provided, including methods involving depositing an oxide coating prior to heat treatment of the blade material and heat treating under conditions selected to enhance the color of the coating.
1. A method of manufacturing a razor blade comprising
applying an oxide coating to a blade material wherein said blade material comprises stainless steel;
subjecting the coated blade material to a hardening process wherein such hardening comprises subjecting said material to a furnace having a temperature of greater than about 1100° C.;
subjecting the hardened material to oxidation;
quenching the blade material to initiate martensitic transformation of the blade material; and
forming the hardened coated blade material into a razor blade, the oxide coating providing the razor blade with a colored coating.
2. The method of claim 1 further comprising controlling the hardening process so that the composition of the oxide coating is changed by the hardening process.
3. The method of claim 2 wherein the controlling step includes controlling the ambient conditions under which the hardening process is performed.
4. The method of claim 3 wherein the controlling step includes providing a chamber within which the hardening process is performed, and introducing one or more gases to the chamber during the hardening process.
5. The method of claim 4 wherein the gases are selected from the group consisting of nitrogen, hydrogen, and oxygen, carbon monoxide, carbon dioxide, nitrogen oxide, nitrogen dioxide, water vapor, and mixtures thereof.