The visors are kind of a purple/pink color. When there isn't a head inside it is easy to see through the visor to something lighter behind it such as the wall in the photos. Most of the visor doesn't look like that in the straight on views because the back of the helmet (with black liner) is behind the visor.
The early Anovos helmets had a double visor. Two pieces separated by a small amount. I don't know if that was for safety or to make it darker. The Anovos in the photos has a double visor. I believe they switched to a single visor at some point. A downside of the double visor is the inner visor is a little closer to your face.
The Denuo Novo helmets have a single visor.