This is a term referring to a number of monochrome methods in visual arts. That is, it shows us Black and White Photography such as Black and white. It was often abbreviated B/W or B&W. Then they started to combine black and white in a continuum generating a variety of shades of gray. Furthermore, many prints, particularly those formed earlier in the advance of photography, had been in sepia. This indicates the yielded richer and more subtle shading than replicas in plain black-and-white. In short, learn to understand the world in glooms of grey and notice the art of black and white photography.
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