Green Cover On Coins

That's cool, I'm just explaining the science. I will add that it's true about a "protective" coating. A light covering of verdigris WILL provide "protection" to the surface in that those metallic sites are occupied and only able to react if a stronger anion comes along. Nonetheless, the verdigris is not static, it is in a constant equilibrium state and the corrosive process will continue on a micro-scale. If the coin is well protected from air, water and temperature swings, the rate will be so low that you won't see the corrosion process progress in your lifetime.

Just to add one last, hopefully, notation. If you'll read back a few posts, you'll see where I explained what happens to Copper or Copper mistured wires and cables used for Grounding systems. If not properly covered with lesser or non corrosive coverings, they completely dissentigrate. Salts and acids of all kinds in and on the ground attack those grounding systems and distroy them. Copper and Copper mistures are always used due to their great conductivity but unfortunately they react with so many other elements, their effectiveness is short lived unless properly protected.
Naturally coins are not normally kept in or on the ground but the end results are similar. Your breath, nasal drippings, your finger oils and acids, coin carrying pouches and on and on with everything possible to ruin a coin.
Which is why the Mint workers everywhere have a life time job.

You're right JustCarl...I did miss that piece of your commentary and personalized it instead...and regarding your "green" problem...may I recommend www.verdigone.com?...thanks to you also JC for your patience and I get what you're saying about the better part of our population...though we went through this in derivative fashion first with radio and then with television; now with the internet...