Divine blue
Sensual red
Deathly green
Glistening gold

These four colours tell the story of art in a way that few other elements can. From the pigments used to make them - sometimes wildly expensive, like ultramarine, or dangerously toxic, like emerald green - to the varied and changing meanings applied to them, these colours grant us access to fascinating stories, both of individual works of art and the world in which they were created.