They can lighten or darken the tan, but some bodybuilders choose to make themselves way too dark. That is a classic mistake, and had cost quite a few bodybuilders some placings. You dont need to go so dark, just a good tan.
my first few shows I used Jan Tana, liked it, but my last show I switched to Dream Tan and I liked that more!
What's that stuff that makes you look like a bronze statue? Everyone should stay away from that stuff.
pro tan?