Whether you need a disguise to run from the law or are just trying to emulate *NSYNC-era frosted tips, you may need some chemical assistance to put the hue in your do. To understand how these "shade-y" changes happen, you have to dive back into the history of chemistry. In this week's Reactions episode, get ready to learn everything you're "dyeing" to know about artificial hair color

Reactions is a video series produced by the American Chemical Society and PBS Digital Studios. Subscribe to Reactions at https://bit.ly/ACSReactions, and follow us on Twitter @ACSreactions.

The American Chemical Society, the world's largest scientific society, is a not-for-profit organization chartered by the U.S. Congress. ACS is a global leader in providing access to chemistry-related information and research through its multiple databases, peer-reviewed journals and scientific conferences. ACS does not conduct research, but publishes and publicizes peer-reviewed scientific studies. Its main offices are in Washington, D.C., and Columbus, Ohio.