Bendik Posted March 14, 2007 Share Posted March 14, 2007 Yesterday I was peeling a kiwi with a knife I made a while ago. When I was done I washed the knife with some water, and as I was drying it I noticed that where the steel had been in contact with the kiwi there had appeared tempering colors. From blue through purple to yellow. Is this normal when steel comes in contact with acids? I have never experienced it before. Quote Link to comment Share on other sites More sharing options...
HWooldridge Posted March 14, 2007 Share Posted March 14, 2007 The Filipinos etch their kris knives in fruit juice. Can't vouch for colors but it will raise the pattern. Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted March 14, 2007 Share Posted March 14, 2007 Yes this is normal with the alloy and the fruit working together on how much will occur---why 19th century "fruit knives" often had a silver blade. The plain carbon steel blades left a bad taste on the fruit. Thomas Quote Link to comment Share on other sites More sharing options...
Kurr Posted March 15, 2007 Share Posted March 15, 2007 I got an uncle an every time he buys a new knife like a case folder, he sticks the blade in a potatoe an leaves it overnight, maybe a day to blacken the blade Quote Link to comment Share on other sites More sharing options...
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