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Message:: [QUOTE="BadThad, post: 535404, member: 17261"]I surely would not return that coin based on that. It's a beautiful Lincoln and verdigris is just something we collectors have to deal with on copper. As long as the process is halted and the coin protected from air and moisture, it's not a big deal when it's so small. Jack, if you ever decide to remove verdigris with a spot that deep, you'll have to introduce a little physical action.... more than likely. While VERDI-GONE™ would certainly remove most of it, I suspect that last little bit would need to "nudged" with a tooth pick while soaking in VERDI-GONE™.  What I do is put the coin in a shallow, glass dish (actually a petri dish) and keep dabbing the spot, no rubbing, just an up and down tapping motion. This takes patience, I've sat there for 15-30 minutes prodding away before.....I've had about a 90% success rate with this technique. Unfortuately, I'm not always pleased with what's underneath, as sometimes there's a pit where the copper was actually pulled from the surface by the verdigris. Nonetheless, this is better than over-exposing the coin to VERDI-GONE™ for an extended time which can alter the patina.  Remember, you only want to use the product for the minimum amount of time for the best results.....shorter is always better. Always remove the coin and rinse with distilled water as soon as no more progress is being made.[/QUOTE]