 The amount of white, even if none is present at birth, often grows throughout the horse's life by gradual "roaning" which is not related to graying or true roan.Colored spots reflect the underlying coat color, be it black, chestnut, gray, or silver dun-buckskin.A number of factors, each separately, genetically controlled, interact to produce familiar patterns such as "snowflake," "leopard," and "fewspot".