Just a bit of a "how did they do it" type of question.

I have been looking at some period (40's, 50's, 60's) glamor/pinup portraiture of late and have been wondering how I could possibly re-create certain aspects.

The one thing that has struck me is how often the lips nearly look very dark and often nearly completely black. Considering that the skin is also quite washed out, it has my thinking how and why does this occur? Is it due to the use of Ortho film? Or is there filtration in play?

Can anyone give me an insight?