You can rebottle in a bottle labeled used and continue to use till it is a dark color or starting to thicken. Than you can pour it in a paper bowl and let it evaporate. Make sure no pets or other critters can get to it. then pitch the residue.
For coins that you consider valuable, I suggest one-time use of acetone for coins. If one wished to save it for other uses as a solvent, that would be fine. The EPA and most states have acetone as a non-HAP material, meaning it can safely be allowed to evaporate into air, it's main problem is flammability and oxygen displacing. So working in a relatively open , non flame containing area is a necessity. If you are just storing a gallon or two, you still have a danger, but legal. Larger amounts or an enclosed area should have it stored in a flammables locker. If by any reach of imagination, you are storing above 10,000 lbs of it, you must, in most states ,register with the local fire and emergency services, and in most states, is not allowed in higher density residential zones. Insurance may be invalidated in some states if not followed.
