Eeeeek!

So, I've had this silver thimble for a while, it's fine, CHEAP, and easily replaceable.... BUt I've been doing a lot of hand quilting lately, and so decided to buy a backup... I bought this Fons and Porter gold-colored (brass) one. Today, I used it all day, in lieu of the nice silver one... 
LOOK WHAT HAPPENED TO MY FINGER!!!!!
It's GREEEEEEEEEN
Dish soap and water does not remove this horrible green tinge from my finger. (Does any one know what I can do to get it off? I assume it's a chemical reaction of some sort?)
So, uh, be warned. Buy the cheap one. It won't stain your finger.