Summer looks great on everyone. What it does to color-treated hair is a different story. If you've ever noticed that your color looks a little duller, a little brassier, or a little flatter by mid-July than it did when you left the salon in May — that's not your imagination. Summer is legitimately the hardest season for color-treated hair, and most people don't think about it until the damage is already done. The good news: a little preparation goes a long way. Here's what's