Why Has Munch’s ‘The Scream’ Been Fading? Because We’ve Been Breathing On It

On the 1910 version of the painting, housed at the Munch Museum in Oslo, the cadmium yellow in the sky and the lake has been fading to off-white and flaking off for years, with light believed to be the culprit. A team of scientists has now found that light is not the problem: the dulling is caused by high humidity, particularly from the breath of many thousands of viewers. – CNN