How To Get Dates Off Of Dateless Coins?

To expand on my last post, here are the coins you should not acid date:

Wow, that was fast. My first time doing this and it's kinda fun. How'd I do guys? Looks like I have a newly discovered 1918-s & 1925-p or maybe I can put the 25 back in for more mm area etching

And here's the before...

The liquid around the buff is turning blue? Haha this is weird.

I happens during the chemical reaction... But its pretty cool!

You can make out the shape of the date a little. I am going to let it soak longer. This is exiting.

Cascade, I would definitely soak the back of the 25. Keep in mind I've found it takes longer to get the MM than the date when soaking. The MM isn't as pronounced as the date when the coin is struck, so it takes longer to reveal it with vinegar.

Silverstacker, when you say rubbing what do you mean? Are you taking your finger and rubbing the date area? I would strongly recommend against that. When you acid date a buff, the remaining date is very vulnerable to being rubbed off again. And once you rub off the date from an acid treated nickel, it will never come back.

I see. Definitely be as careful as possible with that. I have had a couple where the date wore back off even with just light handling and that was that. I would just wait until the date is visible even with the vinegar still on the coin if I were you. Then rinse it off and just give it a light dab with a cloth or paper towel to dry it.