Pravana, which is a good brand... is demonstrating some color changing locks with what seems as simple as a heated blow dryer..
[PS if you DON'T want your hair color to change, my tips are here since everyone always asks!]
Unfortunately, they're not saying much about it right now.... Is it actually just heat? Does it change back when you put it in cold water again? Cuz that would truly be LIFE CHANGING for all the people who have stupid jobs who won't let them have fun hair.
I'll be paying close attention... in the meantime, feel free to drool at everything my girl Ruby does.