... 67 poets take on 'indigo' The term indigomania was coined for the Impressionists' unhealthy passion for blues. from 'The essence of blue' by Belinda Recio and Catherine Kouts ... One year one paints violet and people scream and the following year every one paints a great deal of violet Manet remarked on a different occasion. from 'Color in the Age of Impressionism: Commerce Technology and Art' by Laura Anne Kalba