Whether you do it in the shower with an old friend or stick with a paid professional, your very first time is hard to forget. And it’s much, much harder to reverse. We’re talking coloring your hair, of course. (Sick. You people are sick.) And though you can’t reclaim your hair’s original virtue, you can get pretty close with Tommy Gentekos. An expert on restorative hair coloring, the Walnut Street veteran stylist will remove the blackest of Elvira blacks from your once golden locks without leaving them looking ravaged. (You’re a natural redhead? Who knew?) Gentekos’s storefront salon is so unsalonish, you’ll feel like you’re hanging out in an artsy pal’s studio. Afterward, your friends will swear you’ve got sweet virgin hair. Though we can’t promise they’ll say that about the rest of you. Tommy Gentekos Hair Salon, 2104 Walnut Street (215-563-9355).