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If you want to go for an emo look, forget about subtlety and playing it safe. Emo hairstyles are all about dramatic color, contrasts and standing out in a crowd. Stay away from any box of dye you think someone's grandma might approve of. Instead, shoot for a super extreme style with midnight black and extra bold shades of dye.
Rock the classic color favored by the emo masses: total jet black. Inky, dark-as-night black locks are a staple in the emo community, so grab a box of the darkest black dye you can find and slap it on. Wear old clothes so you don't accidentally stain a cool outfit, and make sure you wear the gloves that come with your dye kit. The specific instructions vary depending on your dye brand, so follow those directions to the letter.
Try a non-permanent black hair rinse if you're not ready to commit to a permanent color. You can find temporary hair color in most beauty supply stores or drugstores. Again, don't deviate one bit from the printed instructions.
Play with contrasts to create a more complex emo look. If basic black is too boring for you, add some bright highlights. Forget subtlety: think bright psychedelic pink, blood red, purple or blue.
Opt for high drama when deciding on the placement of your highlights. Create peek-a-boo highlights by keeping the top of your locks black and dying the underside of your hair a bolder, brighter color. Streak just the tips of your hair, or brighten asymmetrical chunks on either side of your head.
Go icy white if dark hair's not your thing. Since emo is all about extremes, sunkissed golden hair or subtle strawberry blond just won't cut it. Extreme bleaching isn't the easiest style to pull off at home, so it's a good idea to see a stylist to get a pro bleach job. That way, your locks won't turn out orange and you don't have to worry about burning yourself with crazy chemicals. After you're all white, you can think about throwing in some bright colored streaks or highlights, too.
Look at pictures of emo hairstyles to get some ideas.
Beach and dye can really stress out your locks. Make sure to follow up with some deep conditioning treatments so your hair stays smooth and shiny.