Unfortunately, there is no way to "remove" color transfer because it becomes part of the leather. The only solution (well prevention, rather) is to take good care of your bags. But I own multiple vernis pieces, and I've never had a problem.
Thats why I don't buy really light vernis pieces. It happens to the darker pieces as well but IMO it doesn't look as bad. My SA said that there is no way to remove this after it happens So just be careful!@
I wanted a Reade for Valentines but the SA talked me out of it, she had me scared it would practically disintegrate in my hands! HAHA. Seriously she was just saying "Don't wear black jeans with it" or the dye from the jeans will rub off. I don't wear jeans anyway, so I got the Speedy 40.