Okay, I've been doing some thinking. Speaking in terms of portraiture and the look of older, 1930's era photos. Would using a deep blue filter on a lens yield the same results? Just like an orthochromatic film I would suspect that it would obviously make and blemishes, blush and redish makeup as well as freckles stand out. What makeup would be good to counter this? Just a lighter base or as silly as this sounds- is there such thing as a makeup with a faint bluish tint to it, enough to render the skin an even, light tone?