It’s a grey area

QWhat’s the difference between monochrome and black and white? Kelly Thomas

AIt’s a subtle difference. A blackand-white image has various tones from pure black to pure white, whereas an image can be called monochrome whether it’s black and white or a tonal range of one basic colour. For example, a sepia or a cyanotype (blue) image could both be called monochrome. This single colour was added to prints in the traditional darkroom using chemicals, but these days we replicate it in postprocessing software.

Always remember that a monochrome image doesn’t have to be black-and-white. B&W

Monochrome