monochrome
adj.
Having a single color.
monochromatic, adj.
PhotographyBeing sensitive to only one color in the spectrum.
Notes
A monochrome1 image may have many shades of the same color. For example, a cyanotype is a monochrome image with many shades of Prussian blue. Although the phrase 'black and white' is commonly used to mean monochrome, it is properly limited to items with neutral shades of gray. - Early photographic emulsions were monochromatic2 because they were sensitive only to blue light.
