You can mix and match Rit dye colors to get the shade you’re aiming for. Now, you might be thinking, “Can I use any dye?” Not all synthetic dyes work on Crocs because of their unique material, so ...

California is banning them in schools. The FDA says they’re fine. But synthetic dyes added to food to make them more colorful have a long, troubled history.

California bans specific synthetic food dyes in schools. FDA maintains approval despite health concerns. Studies link synthetic dyes to behavioural issues in children.