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Bohler-Uddeholm is a Swedish steel company, not just a type of steel. I use their raw materials for blades I make whenever possible. Their quality is exceptional.

To be very carefully clear...these colors are oxides that occur during the tempering cycle of heat treatment. This is not the "tempered steel" nomenclature where a tempered bar was a hardened bar. ...

Good summary Neil.

In Japan, the "color" is related to the paper it comes wrapped in. The grades include blue, white, yellow and green. The steel when exposed is silver/gray like all clean...