In 1379, one Thomas de Crosby was entered in the Poll Tax Returns of Yorkshire, and in 1383, Henry Crosseby, witness, was noted in the Assize Court Rolls of Warwickshire. Sir John Crosby was sheriff of London in 1470, and Brass Crosby, lord mayor of London (1770), became president of Bethlehem Hospital in 1772.
Monochromatic colors are all the colors (tints, tones, and shades) of a single hue. Example of a monochromatic color scheme. Monochromatic color schemes are derived from a single base hue and extended using its shades, tones and tints. Tints are achieved by adding white and shades and tones are achieved by adding a darker color, gray or black.
Monochromats can match any light with a single primary. They generally have no cones and make all matches using rods. They are very rare, 1 in 10,000,000. With only a single receptor type, they can have no color vision and are truly color blind because they distinguish only brightness levels.