Laquered Large Cent

My guess is it will be fine, as long as the wash is changed often. You don't want that thing sitting in the sludge for long periods of time.

That is right. What effect it would have on lacquer is another question. My guess would be none at all.

So I just spent a few minutes reading about 'lacquer thinner'. Enough to make me hesitate to use it on coins. There's no real way to tell exactly what your 'lacquer' is made of, and it might be soluble in different solvents. We know that acetone and xylene are safe for coins, so if you have either of those handy, it's worth a shot. If not, it's probably not worth it to buy a jug if you'll never use it again.

As for lacquer thinner, you can do your own interweb search, but it appears to be a blend of different solvents, and is caustic to many substances. I either wouldn't try it at all, or practice on a cheaper coin first. Maybe you can lacquer a few copper lincoln cents and practice...

The process I use is to put the solvent in a shallow container. Don't use plastic! Glass or ceramic is ok. Then put the coin in and let sit for a variable amount of time. Flip over if the bottom isn't exposed. I cover the top with aluminum foil to prevent evaporation. Fumes are noxious, so don't spend too much time hovering over it.

-wheatiefan