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I don't know as much about razor production yet, but with wood chisels, companies would often color or paint the metal with blue for blue tempering, yellow for straw tempering, etc. Usually it was a...

In metallurgy, Blue Steel means that the steel was tempered to 590 degrees F.
Other common steels are indigo steel at 540 degrees, straw steel at 400 degrees, and green steel at 650 degrees.
Once...