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To speed up the etching it helps to warm up the vinegar, at room temperature de-scaling a blade may take over night. But if you do like I do and keep the vinegar in a tupperware like container, warm it for 2 or 3 min. in the microwave (WITHOUT ANY STEEL IN IT) and it will knock the scale off in a matter of just a few moments.
Location Central NM, USA, Sol 3. Posted May 4, 2020. Yes; you can use a vinegar soak to remove scale. Usually I do it overnight with full strength "household vinegar" and then wash off the black crud under running water and oil immediately to avoid flash rusting! Have the item completely immersed as liquid/air transitions can etch into a surface.
Two hours in muratic acid made it so you could you could see a difference in coloring and direction of the grain, but didn’t make the texture different. Three hours in a mixture of vinegar, H2O2, and NaCl seemed to etch much more aggressively. The grain was apparent to both the eyes and touch.
Pick a metal that is more reactive/higher up on the chart than the metals in solution. Put a piece of that metal in the solution. It will go into solution/dissolve and precipitate out all metals lower on the chart. Filter out the solids and then kill off the acid. For very acidic solutions I use sodium carbonate.
To re-etch your knife, get the whole blade to the same wear level. Doesn't have to be perfect, but close enough that you don't end up with an uneven, blotchy finish at the end. The scrubbing side of a sponge is often enough to make things uniform. After that I would fix the rolled edge, but you could do that at the end if you prefer.
Use skin, eye, and vapor protection. And do it outside away from people and animals. Better yet stick with vinegar instead. (which is a 5% acetic acid solution) in water. Highly diluted zinc acetate salt (the product of vinegar and galvanized steel). can be put on a garden that is alkaline.
There is some depth, but even a light sanding with 5000 grit will remove it. Attached is a photo of the earring. This time it was hardened without temper, etched for 24hrs in 10% ferric, wire brushed, then etched for a few min in boiling white vinegar. Finally I hit the high spots with 5000 grit wet paper.
Very important for having a good etch is, You have to create a good surface. Coarse marks will always show up dark and disturbing..... 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. I am no coffee drinker but I like a good fresh, brewed ...
Etching it in vinegar might work, but I'd suggest going back over it with the two or three finest waterstones you can find, or perhaps make up some emery sticks out of the finest Wet/dry paper you can find - 3M makes some that go down to 15000 grit, which is just about right for the final (insane) japanese finish...
Etching is generally a term used in the producing of a design in metals. Generally it means taking a piece of metal such as copper, or steel and coating it with wax or a product called asphaltum, that makes a protective surface coating on the metal that is easy to scratch a design into it.