 Fairly common among calicos, dilutes are distinguished by having grey (known as blue), cream and gold colors instead of the traditional black, red and brown patches along with their white.Dilute calicos are also called "light calicos" because they have no dark colors in their coats.The coat pattern of calico cats does not define any breed, but occurs incidentally in cats that express a range of color patterns; accordingly the effect has no definitive historical background.