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.
For example, yellow is a primary color, and painters can make purple by mixing of red and blue; so when yellow and purple paint are mixed, all three primary colors are present. Since paints work by absorbing light, having all three primaries together results in a black or gray color (see subtractive color).