The French Impressionist painters discovered new means for painting light - they used a "solar palette", the pigments matched to the colors the eyes see. They are the colors of a ray of light.This little book reproduces palettes by several of the plein-air painters, describes the pigments they used, and includes short excerpts by the scientists whose work was the foundation of this new kind of painting - complementary colors, optical mixing, and pigment-color correspondences. It closes with color swatches of the pigments, provided by the London artists' colormen, L. Cornelissen & Son. This book will be of interest to art historians, collectors, students, conservators, and museum-goers.