Tan Lotion?

One of my nieces called me the other day asking if I have a tan lotion that she can borrow. She said she off for the beach on the weekend and can't find the brand of tan lotion she prefers. Because she has a dark complexion I asked her why she prefers sun tan lotion instead if sunblock. Apparently, she turns "gray" when she uses sunblock! Anyway, I pointed her to a store where she could buy the tan lotion. I wonder what's her "color" now