Bladesmith Walter Sorrells shows the lemon juice acid etching process that he uses as the final part of polishing his Japanese style swords. In this case the blade is a tanto, the shortest of the three sizes of Japanese blades, the larger two being the wakizashi and the katana. Unlike in Western style knives where polishing is mainly intended to make the blade shiny, the intent here is to bring out the hamon or "temper line" which is characteristic of all swords of the samurai.

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