Wikipedia
Blue-gray (American English); blue-grey (English) is a medium bluish- gray color. Another name for this color is livid; this color name comes from the Latin color term lividus meaning "'a dull leaden-blue color', and also used to describe the color of contused flesh, leading to the English expression 'black and blue ' ".
There is a range of colors called livid colors that combine the colors blue and gray. Some of these colors are shown below.
Livid (blue-gray) is the opposite concept from brown. Brown colors are mainly dark orange and dark red colors—warm colors on the warm color side of the color wheel, while blue-gray (livid) colors are mainly dark blue and dark azure colors—colors on the opposite side of the color wheel—cool colors on the cool color side of the color wheel.
The first recorded use of livid as a color name in English was in 1622.
Blue-Gray was a Crayola crayon color from 1958 to 1990.