Edited to add: by 'not natural' I mean artificially
applied in this day and age.
I just don't consider a few of the ones that *I* have natural. Mostly because the seller who sells them has the exact same
patina on every one of
his coins, no matter the location. He's a big name, so I won't name him here (especially since I have no proof)-but it's quite easy to spot one of
his coins. I even got one from him that
had a thumbprint smear in the gluey dirt - I removed it.
He does have some
rare coins, so I buy them anyway.