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Its trial and error. Different metals are going to react differently to the solution. I'd try rubbing it on at first and see how that goes, if you think it needs a soak, start with 1-2 minutes,...

It is called Printed Circuit Board(PCB) Etchant Solution. It is diluted 50/50 with white vinegar. Be sure to add the etchant to the vinegar. If not, there is the possibility of a "splash-out"...

I was shown a technique for etching from a guy named Dave Martell. He owns a sharpening business that specializes in Japanese steeled and styled knives. He uses an etching solution that can be...

I used the recommended strength and soaked them for five minutes. Most of the parts were chromed steel, I don't know how it would react with the steel in the razors. I guess that a 5.00 eBay or...

I've used oxalic on bicycle parts and it works like a charm. Its not the same as razor steel, but it worked for me in that situation.