Richard Trudgen answers the question "Was there any barter or trade between different groups of Aboriginal people "
In Central Australia, there were three kinds of ochre used in the main. They were yellow ochre, white ochre – or white pipe clay – and red ochre. One of the most widely used ochres was red ochre, which was extensively used on the body. And in some particular mines in Central Australia, the ochre has a mica component, and when it’s placed on the body, particularly on the face, it gives off quite a shiny look. And that’s still used today in ceremonies, and is traded all around Central Australia and beyond.