I was inspired by Tuney's thread about fading pink hair a bit ago found here.
It got me thinking, how badly does artificial light affect pink hair? So I decided to run a small experiment to find out what common types of light would do.
I used a brand new hank of Dollyhair Pussycat, which is the equivalent of the fading pink. I cut four equal lengths and labeled them (sorry about the glare):
It took 6 weeks for the hair to completely bleach in the sun. The others remain unaffected. They are identical to unexposed Pussycat. So, just keep your ponies out of the sun, common types of artificial light, even "daylight" light are safe ^^