Photo of the painting “Flowers in a blue vase” by Vincent van Gogh. The discoloration is located on the right side of the bouquet. Image courtesy of Kröller-Müller Museum Since Vincent van ...

Researchers have spotted a never-before-seen chemical effect in Vincent Van Gogh's Flowers In A Blue Vase that is dulling the work's vibrant yellows. It seems a layer of varnish added later to ...