Power of colour beyond visual appeal and aesthetic beauty

Use of colours in pre-historic era Humans have been long fascinated by colour, which has played a significant role since the beginning of human civilization.

- BY EMERITUS PROFESSOR RANJITH SENARATNE

Ancient people had painted caves even before they settled in houses. Cave paintings were created during the stone age from 10,000 to 40,000 years ago. Primitive artists used natural materials available to them to mark their territory, beautify their surroundings, and tell their stories. For thousands of years, paints were handmade from ground mineral-based pigments. Ochre, a natural pigment which comes in shades of red, yellow, orange and brown, was the first pigment used by humans, in the Middle Stone Age of Africa. Ochre, also called hematite, is found all over the world and has been used by nearly every prehistoric culture, whether as paint on caves and building walls, for staining of pottery or other types of artifacts, or as part of a burial ritual or body painting.

Man's irresistible desire to create pigments was not without untoward consequences. For instance, in 1,775, Carl Wilhelm Scheele, a Swedish chemist, invented a bright green pigment, but it was laced with the deadly poisonous chemical arsenic; it was cheap to produce, but dangerous for artists and patrons alike. However, the French emperor Napoleon Bonaparte was so fascinated by and passionate about this colour, he wanted his bedroom wallpaper painted with Scheele's Green. Historians believe that the green pigment used in the wallpaper caused his untimely death in 1821 at the age of 51 due to cancer. By the end of the 19th century, Paris Green a mixture of copper and arsenic replaced Scheele's Green as a more durable alternative, enabling Claude Monet, Paul Cézanne, and Pierre-Auguste Renoir to create vivid, emerald landscapes. It is also toxic, and thus has also been used as a rodenticide and insecticide. The blindness which Monet subsequently succumbed to may have been due to the toxicity of Paris Green, which was banned in the 1960s.