WASHINGTON--(BUSINESS WIRE)--A painting hanging on the wall in an art gallery tells one story. What lies beneath its surface may tell quite another. Often in a Rembrandt, a Vermeer, a Leonardo, a Van Eyck, or any other great masterpiece of western art, the layers of paint are covered with varnish, sometimes several coats applied at different times over their history. The varnish was originally applied to protect the paint underneath and make the colors appear more vivid, but over the centuries
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