Nikonuser - Sorry perhaps I was not clear, I did not mean that I print in colour using ABW, I mean that I was under the impression that ABW is for printing B&W from a colour image without first doing a PS B&W conversion?
Here is a bit from thr 3880 manual:
Advanced black-and-white photo printing is available in the Color Controls dialog, allowing color images to be printed in black-and-white without first converting them to monochrome in the imaging application. The print image is adjuted without affecting the original data.
Note:
Even in ABW modes, ink from all cartridges is used to keep the print heads in good condition.