on copper coins...moderately expensive...15 mls for $9.99 but the shipping was fast and free. This should be interested because this is advertized as a preservative liquid, not a cleaner. It is called Verdi-Care and you can google that and find numistmatic websites that list it for sale. The company's website has numerous collector submitted images of before and after. For minor Verdigris (that's the green crud or rot often on IHs and older Large copper coins), a single small drop will remove the green...leaving a small black or dark mark...looks much better than the green lump! Nothing will restore orignal luster of the metal, but when the green is gone, the liquid contains a water repellent component that will penetrate the cleaned metal and prevent moisture from ever accessing the metal again, thus preventing the rot reoccuring...KT has no coin to try this on yet but plans on doing a before and after shot...If someone has a slightly green rotted IH or large copper penny they do not highly value...He would love to get a chance to try this product and report to the Forum about it! PM me if you have one to do...I will take up to 3 to test. OH, and don't send me a rotten zincoln that will not improve in value by preserving! 
And YES, send KT a return stamped self-addressed envelop and you will get your improved coin back! Just want to try this stuff out....not keep your coin! LOL
And YES, send KT a return stamped self-addressed envelop and you will get your improved coin back! Just want to try this stuff out....not keep your coin! LOL
