How does hair dye work?

If you could turn your hair any color in the world… what color would you choose?! Sapphire blue, hot pink, lime green, neon orange?? There are dyes out there that can turn your hair every color of the rainbow! But how exactly do they work? We asked Chemist Michelle Wall to help us understand. Got a hairy question that needs answering? Send it to us atBrainsOn.org/contact, and we’ll style an answer for you! See omnystudio.com/listener for privacy information.