Lifespan




To maintain their cutting action, razor blades can be stropped using an old strip of denim.

Safety razor blades are usually made of razor steel which is a low chromium stainless steel which can be made extremely sharp, but corrodes relatively easily. Safety razor blade life may be extended by drying the blades after use. Salts from human skin also tend to corrode the blades, but washing and carefully drying them can greatly extend their life.

Disposable safety razor blades can be sharpened using various methods. There are commercial devices intended for this duty (Razormate, RazorPit, Blade Buddy, etc.).

Myths claim that it is possible to sharpen a disposable razor blade by utilizing a pyramid but this is pseudoscience.failed verification

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History

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Early designs edit The first step towards a safer-to-use razor was the guard razor – also called a straight safety razor – which added a protective guard to a regular straight razor. The first such razor was most likely invented by French cutler Jean-Jacques Perret circa 1762. The invention was inspired by the joiner's plane and was essentially a straight razor with its blade surrounded by a wooden sleeve. The earliest razor guards had comb-like teeth and could only be attached to one side of a razor; a reversible guard was one of the first improvements made to guard razors. The basic form of a razor, "the cutting blade of which is at right angles with the handle, and resembles somewhat the form of a common hoe", was first described in a patent application in 1847 by William S. Henson. This also covered a "comb tooth guard or protector" which could be attached both to the hoe form and to a conventional straight razor. The first attested use of the term "saf
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Design

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Safety razors originally had an edge protected by a comb patterned on various types of protective guards that had been affixed to open-blade straight razors during the preceding decades.
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