Of course in pre-computer times, not all colours were available. Colours had to be hand made from various organic and mineral compounds, and the process of that was often expensive.
Originally shared by The Public Domain Review
A visual history of colour wheels, charts, and tables: from simple circles to multi-layered pyramids, from scientific systems to those based on the hues of human emotion. Explore here: http://buff.ly/2nlpQQ5
