GRAYSCALE . . . THE NEW WAY TO COLOR
This "grayscale coloring book" features lovely black-and-white photos with more than enough variety to hold your interest, page after page. Photos are printed on one side of the paper only, with frames of gray and black. And all photos are specially processed for "reduced grays," making your colors show brighter and clearer than with ordinary grayscale, while also providing greater contrast. It's a perfect book for any grayscale colorist, from beginner to expert.
Though grayscale calls for a different kind of coloring, that doesn't make it harder -- in fact, it makes it easier to get stunning results For tips, just search online for "grayscale coloring."