This video the tutor teaches you the south and north variations of colours.
Towards the end of the video repeats these signs and gives you some handy tips as a way to remember them. This is particularly helpful for those teaching children. For example, RED - point at your lips. ORANGE - mime eating carrot, and so forth. When you need to remind a student (or yourself) you say 'lips' or 'carrot' as a prompt.
See the attached PDF for a list of signs taught in this video.