Purple is probably the most precious colour and was long reserved for the rich and powerful. It is extracted from sea snails. In Mexico, a small number of Mixtec people still know how to dye purple right onsite at the Pacific coast. In the south of France, German artist Inge Boesken Kanold has discovered how to extract a purple pigment and paint with it. These two films continue our series 'Colours as bright as nature'. We introduce people who are ensuring the knowledge of ancient natural dyeing techniques is not lost. It is nice to watch the films in a row, but they also work on their own.