OK, so as some of you may or may not know, I recently got a set of extension tubes. Again, as some of you may or may not know, I needed to return my camera because there was dirt in the viewfinder. Since I've gotten the new cam, I've been afraid to remove the lens for fear of getting dirt in there again. I have finally realized that this is stupid, and the ability to change lenses is the EXACT reason I spent the money on the DSLR. So, this weekend I'm gonna use my extension tubes. As such, I wanted to get some shots of some old coins I have, but as they're old (and by old I mean I got them in the 80s, not that they are worth anything--actually, they're technically worth nothing now that the Euro is in place)...damn it I lost my train of thought...oh, right, so since they are old, they're dirty and off-color. So, I was wondering if any of you on the Forum are numismatists and if anyone knew a good way to clean up the coins so they will be pretty under my lens. Thanks as always.