Several years ago, the owners of an old, dusty painting walked into an art gallery in Vienna. They presented experts with a ...

"However, he also embraced the process of painting one work over another, resisting whitewashing old images in favour of beginning a new figure directly on top of an earlier one. It is as if the ...

The painting is then cleaned in wider swaths, and the difference between an old, yellowing varnish and the original painting becomes clearer. "I save the face for last in this instance ...