How do art experts determine the authenticity of a particular painting or sculpture?

They look for those unique characteristics or quirks held by each artist that give away his or her identity.

It could be the type of bristle preferred in a brush. It could be the location from which a marble slab was quarried. It could even be something as subtle as the depth of the paint, or the lightness of the chisel. All work together to portray the artist as much as the artist was working to portray his or her subject.

Writers and speakers are artists as well. They too demonstrate the same tendency towards unique mannerisms and literary tics. For example, the annual Hemingway write-alike contest (sponsored by a bar Hemingway always hung out in - I can't remember its name) pokes fun at Hemingway's r…