TikTok / @chelseamakeupx; Instagram / @sophiasinotIf you have brown eyes, TikTok wants you to put down your black mascara. The better option, apparently, is blue.Sure, it sounds a little bold, but the colorful swap actually has some logic behind it. Eye-maxxing, the TikTok beauty trend rooted in color theory, is all about using complementary shades to make your natural eye color stand out. For brown eyes, that’s where blue mascara comes in.“Brow…