A new and relatively simple method for discovering the date when centuries-old art prints and books were produced has been developed at Penn State. The method could reveal long-sought information about thousands of undated works printed on hand-operated presses before the development of modern printing methods in the mid-19th century, including works by Rembrandt and Shakespeare. "The discovery that the wood blocks and metal plates used for printmaking deteriorate at a clocklike rate means that we can now use the prints as a 'print clock' for determining the date a work was printed," said Blair Hedges, professor of biology at Penn State and author of the paper describing the research, which will be published in the scientific journal Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.
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