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Message:: [QUOTE="Kasia, post: 3359365, member: 31533"]Supposedly ferric chloride which is what is used to etch circuit boards, so you can purchase nicadate or go the generic route. Generic is cheaper usually.  But it should not be on the full coin as it will ruin it for sure. Another option is (according to someone posting on treasurenet.com in 2012) is "Anyway, since I don't have any nic-a-date I figured I'd mix up a small batch of my homemade etchant to see if it could be used to raise dates. The results were pretty good. I added 1 part muriatic acid to 2 parts hydrogen peroxide (always add the acid TO the peroxide and not the other way around). I then used a q-tip to rub it on a couple of very well warn dateless buffalo nickels. The results are shown below. It only took a matter of seconds before I could see the dates starting to appear. The coin on the left was doused in the stuff. So it looks etched all over. For the coin on the right I just dabbed the solution onto the date area. You can see that just like nic-a-date the acid left a small area around the date that is discolored." My point is not to give you definitive info, but be aware that the stuff that raises dates in nickles is potent stuff and possibly should be used very sparingly and with caution. Perhaps others will chime in[/QUOTE]