Yes I know it's not the same scenario, just trying to explain the experience of the colour fading in.
Most people seem to see it as blue black, or on later viewing it changes to blue black judging from Twitter / Facebook.
When I first saw it change I was looking at the image on my iPhone, and I thought it was a joke that anyone saw blue / black.
Browsed around a bit, came back and it had changed. No change in ambient lighting.