When I dyed my naturally black hair to silver last December, and then purple-pink in February, I faced a steep hair care learning curve. It opened up a whole world of products and techniques my formerly low-maintenance self never even knew about. The best way I learned was to talk to women with brightly dyed hair—I’d literally stop them in the street and ask them what shampoo they used. Thankfully, you won’t need to do that. We asked experts who have tried every wild color under the sun how they keep their hair looking vibrant and feeling healthy. Judging by the ongoing unicorn craze, this will come in handy for all of you ready to take the rainbow-colored plunge.