WHEN AN OIL painting is dried and finished, it is supposed to stay that way. Yet when Ida Bronken, an art conservator, began to prepare Jean-Paul Riopelle’s “Composition 1952” for display in 2006, she ...

Grounds, or preparatory layers, form the basis upon which all artistic paintings are executed and can have a great impact on the "success" of a painting, influencing both its aesthetic qualities and ...