I wonder

I always hear people using acid on coins and wonder what's the purpose?

 

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on buffalo nickels, to restore the date

 

On clad coins to purposely damage them!
Why do people damage coins? Because they are bad people and have nothing better to do.

 

Just on Nickels to restore the date. It damaged the coin but you never know what the date is otherwise.

 

Some people us olive oil which is slightly acidic.
It does wonders for copper and is difficult to detect.
That's probably part of the reason that PCGS got their machine that can detect chemicals used to "improve" coins.

 

As to the "bad people" YO FAN'T FIX STUPID!!
Semper Fi

 

Sulfuric acid.

 

To expand your mind, maaaan.

Oh, sorry, I was thinking "coins on acid", not "acid on coins". My bad.

 

Now that's funny. Glad you recognized the difference.

 

"Acid" as a generic term can be used on coins 1) to try and "clean" them (eZest) 2) to bring out dates and 3) to damage them so they look like errors or look "cool"

 

So if you use olives oil and then a mild soap and rinse it good would pcgs still detect it?

 

Don't know, but if I were doing it I'd use acetone rather than soap for the rinse.