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Hi, I have been restoring some old black and white photographs (really old). I typically choose first the Black and White adjustment first so that I can play with the color sliders. What I noticed is that sometimes nothing at all happens to the image when I move the sliders and sometimes something does change. My question is: If you are working on an original B&W image why do the color sliders respond sometimes and sometimes not, since there is no color information? And if they respond, based on what do they respond (again since there is no color information)? I also noticed that when I start from a color photograph and then change it to black and white, the color sliders on the B&W adjustment can make a significant impact on the picture and i assume that is because the color information is there. Anyway, I am just curious about this and wonder if someone has a reasonable explanation. Thanks!