The coin may have 'lightened' because some of the stuff came off and the actual color of the coin is coming through - anything else you use, if it removes more stuff, will more than likely do the same thing. That said, I've found verdi-gone to be the most gentle out of everything I've tried on verdigris that actually works. It should keep working if you wanted to put it in some more. I usually keep it in until I notice the verdi-gone turning blue or purple, then swap it into some fresh. When it stops turning color and I haven't noticed a difference in a while, then it's probably done.
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