11/13/2023 0 Comments Knife patina![]() It’s the most convenient potato trick (in addition to being non-toxic). The colour, one get's, differs with the steel as well as with the patinate.The oxalic acid in potatoes aids in the breakdown of rust. To answer frosty's question: I believe, one could mix acidic (food-)components with interesting results, because there are people using mustard (there's vinegar), onions, ans so on, to force a patina on fast corroding steels.īlood is used also, especially warm, to get a blue patina. I'm at work now and have no access to my pictures while reading this part of ifi, so I will add a picture later. I used no instant, just usual filter-coffee, little bit stronger than I like it for drinking. The patina I built up that way is there now more than a year although the knife gets a lot of use and washing (no dishwasher of course). ![]() ![]() They have a core of so called "blue paper steel", outside there is an unknown steel, corroding within minutes if you let the knife lie wet after cutting and don't care wiping it dry. So I used the etching to build up a grey "patina" on the very sensible outer part of my blades of my bought kitchen knives. I am not good enough yet making my own knives without help, but I hope I will be sometimes. I agree, coffee is great for etching, and (for me) the best is, it is holding up far better i could have imagined. but this instant stuff You should not drink.too much acid. I am no coffee drinker but I like a good fresh, brewed coffee in the morning. The knife shown is coffee etched, there are three components in the steel O7(grey), O2(black) and 75Ni8(white), Grit 1200, etching time about 20 minutes. Coarse marks will always show up dark and disturbing. Very important for having a good etch is, You have to create a good surface. The water should have room temperature, about 25-30 Degree C, dont take hot water, it turns a lot of the acids into base.Ĭompared to ferric chloride it works a little bit slower the first 10 minutes but then it shows much quicker clean colors, no black, orange or olive complexion/smear what sometimes comes with ferric chloride etching.Īnother good thing is You cannot over etch so easy.You leave too long in Ferric chloride You get black pit holes, blisters, bubbles and other ugly signs of over etching.Ī friend of mine forgot a blade in the coffee, remembered it 18 hours later, there was no remarkable damage to the blade surface, just the colors became antique-dirty and changed into black and white instead of black, grey and white.To do some damage it must left in there more than 24 hours, I guess.but I dont want to try that out, no need for that experience. I do not recommend groundwater, take drinking water or distilled water which has less impurities, minerals and that stuff. I always take one sachet (minimum amount to buy)which contains 45 grams and mix it with 500ml clean water.approximately. No harm or damage and discoloration to natural handle materials( well, on snow white Ivory I dont know, haven't tried that yet, but I guess it is no problem, try with a sample) It also gives better colors and it is no problem to etch twice on already finished presentation pieces(no acid surface line) In my opinion there are two kinds of etching, to wash out (H2So4) and coloring(oxidize) steel( ferric chloride, gun blue and other natural etchants like coffee)vine gear and mustard are slow and have uneven and unreliable effects, coffee is the best.Įasy to get, to prepare and to dispose , no chemical handling and waste.No harm to health, no goggles and stupid latex gloves. I wrote this in a different thread, and I think it is useful to share it here again.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |