Two unfinished Cézanne sketches discovered on reverse side of paintings

A Philadelphia-based foundation said the sketches, one graphite and the other watercolour, were found during conservation work Two unfinished sketches have been discovered on the reverse side of two watercolors by Cézanne – and officials at Philadelphia’s Barnes Foundation museum says the collector who bought them more than 90 years ago probably never knew they were there.The Philadelphia-based foundation said the sketches, one graphite and the other watercolour, were found during con