In 1971 Gillette introduced the cartridge razor which contained 2 very narrow blades packaged in a cartridge that could be easily removed from a handle. In the early 1960s the British firm, Wilkinson Sword, began using stainless steel blades and the large American companies quickly followed suit. The blades were made of carbon steel and coated with an oily substance to avoid corrosion. The double edge razor was invented by Gillette in 1904 and was the most popular blade into the early 1970s. Experiments have been carried out with properly cleaned blades showing that after as many as 140 shaves the fraction of the blade length occupied by microchips was still not sufficient to give rise to a significant reduction in shaving smoothness. The last mechanism was only recently discovered and the purpose of this study was to determine if microchip formation plays a significant role in dulling razor blades during shaving.
Razor blades can dull by 4 mechanisms, corrosion of the steel, wear from contact with whiskers, formation of evaporites due to inadequate drying and the microchipping formation produced by contacts with whiskers.
So enough of my commentary, on to his article. I found Professor Verhoeven’s findings very interesting and offered to publish them on this website. This recent study on razor blades was to look at the contribution of micro-chipping on the dulling of razor blades, as a popular journal article recently came out on this mechanism, published in Science.
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And for his work on Wootz Damascus I reviewed his book Damascus steel Swords: Solving the Mystery of How to Make Them. Verhoeven is well known in the knife community for writing Steel Metallurgy for the Non-Metallurgist, a now classic text introducing metallurgy to knifemakers and bladesmiths. Professor John Verhoeven contacted me recently about a small study he did about how razor blades dull.
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