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Old 7th August 2019, 08:45 PM   #16
DaveS
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Join Date: Feb 2006
Posts: 327
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Kai: Iv'e never really noticed what % strength there is on the bottle (actually the can). I have used it for many years and for me anyway it has always given me the best results without diluting it at all. Also unlike ferric chloride, if you happen to get it on silver it won't turn the silver black. As long as you neutralize with baking soda and oil, there should be no later corrosion. At least that has been my experience. Ferric Chloride to me is the WORST acid one can use to etch. It always seemed to give my blades a slightly greenish tinge, maybe because it is a compound of chlorine.........anyway that's what iv'e always thought, rightly or wrongly. Also the Phosphoric gives a nice black on silver contrast. I noticed several years ago that one ingredient in both Pepsi and Coke is Phosphoric Acid. Someday i'm going to try to etch a blade with some Pepsi or Coke. Will let everyone know how it comes out. If it doesn't work at least i'll have something to drink.
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