Oil sketches and studies became accepted as works of art. But not all Impressionist paintings have survived as well as they should.
tubes
Turner’s innovation was driven by his desire to explore colour contrasts and texture. But it led him to lapses in technique which have damaged his paintings.
Did the Impressionists invent plein air painting? And was Impressionism dependent on the supply of oil paints in tubes?
The Eclectic Light Company 