I can't see a problem in mixing them, but the editing has to be more critical perhaps? Does the colour add anything to the 'storyline' or is it gratuitous, or is gratuitous OK and you don't want to force people into reading a 'storyline'? Do you use the colour images as establishing shots, or are they the pinnacle of the expression you want to convey?I would tend to look at documentary books where photographers have used both B&W and colour for jouranlistic work, say the Vietnam people like Larry Burrows, and see how B&W and colour work together without the 'art' banner of rigid conformity (or discipline)to one or another. Of course if the colour work is separate enough in content and treatment to warrant a section on its own, like its all landscape where the B&W is all street shooting for instance, the default position seems to be to insert it all at the back of the book. Steve
P.S. Once again sorry for what reads like a stream of conciousness rant without paragraphs, it must be something to do with my keyboard, but sometimes paragraph breaks do not show up in my text.