What is the best sunscreen to use on a tattoo?

I am taking a vacation in which I want to wear tank tops. This exposes tattoos that are not normally exposed to the sun. They are in great shape and I would like to know which sunscreen I should use that would provide the best protection for these tattoos against the sun, that will protect from the sun yet not harm the tattoo’s color in any way.

Tagged as: great shape, sun, sunscreen, tank tops, tattoo, tattoos