I develop Ektar myself and print it optically and just don't see the blue shadows talked about. I have plotted its curves and see no more crossover than any other film. As has been indicated any blue in the shadows people are seeing may be due to blue reflection from the sky enhanced by its saturation. It would take a lot of crossover to cause users to voice the complaints they have had but I do not measure it. I use Kodak chemistry, perhaps other chemistries cause it.