There are 20 colours for which behaviour is specified: 18 "colourful" colours, which are ordered by a 6-step hue cycle and a 3-step brightness cycle; and black and white which are not ordered.
20种颜色有指定的行为：18种“彩”色，依6步色调周期和3步亮度周期排序；黑色和白色未排序。