Aslanmia

Somewhere over the course of a few months I seem to have developed a HUGE cent collection. I didn't realize how many I had until I started cataloging them... see, I'll keep even the old cruddy ones if they're before 1960.

I'm looking and some of these circulated coins and while not immediately visible to the naked eye, I'm seeing tiny corrosion spots with a 10x loupe.

I know cleaning coins are bad. But if I leave the corrosion and store these coins for 10 years, I'll come back to a big pile of green goo. I bought some of that stuff from Dirty Coins, recommended by GD, that removes corrosion completely. It'll be interesting to see how this affects the coin in general, but hey, it's better then a pile of green goo.

But my question is this...

Is there any sort of ACCEPTABLE coating, varnish, spray, etc., etc., that you can put on a copper coin to preserve and protect it (or any coin for that matter) that is NOT considered cleaning, or altering the coin in any way?

Thanks!

Scott