How Curling your Hair Works
“Heating up the hair heats up the hydrogen bonds – confusing them into thinking they are going to be really curly.
Then you want the hair to curl around a round surface (a roller) so that you get the longevity of the curl, but you get a nice deep wave. So it’s the cooling down of the hair that sets the hair, not the heating up.
When you are softening the hydrogen bonds and then you are stretching them out around a big roller they then harden up around the roller.” -taken from Mister Murphy on his last stop in Portland