I have been using the NIK collection along with Photoshop for a number of years. I print on an Epson 3880 which has four black ink cartridges. Recently I have been doing more B&W and although an image looks great on my monitor, when printed it is printing blue in the deep shadows. There is clipping in those same areas as well. I have searched the web looking for information on this problem and what I find is discussion on blue, purple, magenta, or green casts. The term casts implies to me that people are talking about color casts on the image overall and not just specific to the shadows. My monitor is calibrated with X-rite iOne and color prints print fine. I use color management. I have printed on Epson Exibition Fiber paper and an HP Advanced Pro glossy that I have an Epson profile for. In my recent B&Ws I have been shooting HDRs, processing them through ACR, NIK HDR Efex and then NIK Silver Efex and Photoshop (CS4). I have not saved it as a grayscale but wouldn't NIK Silver Efex strip the color out of the image? Any ideas if the blue is due to the shadows being clipped or....??