That's interesting that it was actually that colour...I mean it must have something to do with light refraction, but I tried looking it up and found this

Depending upon how long you and your cousin were outdoors, the perception that, "all the light is purple" may be a preliminary indication of mild snow-blindness... or photokeratitis. Essentially it is a sun burn of your corneas.

It's very pretty nonetheless, gives a whole new meaning to rose tinted glasses 😁