Science used to reveal masterpiece's true colors: Chemist uncovers paint details of Renoir masterpiece at Art Institute of Chicago

Chemists have been using a powerful scientific method to investigate masterpieces by Pierre-Auguste Renoir, Winslow Homer and Mary Cassatt. They recently identified the chemical components of paint, now partially faded, used by Renoir in his painting "Madame Léon Clapisson." The artist used carmine lake, a brilliant but light-sensitive red pigment.

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