When Whistler discovered watercolour
Financial troubles drove the artist to the medium – but its atmospheric possibilities suited him well
How American artists made watercolour great again
A new exhibition charts the transformation of watercolour painting in the USA, from an overlooked sideshow to a major cultural movement
What William Merritt Chase learned from Europe
The 19th-century artist who brought modern spirit to American painting
Seeing London through Frank Auerbach’s eyes