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The majority of early pictures in the National Portrait Gallery's care are by unknown artists, with fundamental questions, such as when,where and why they were painted still remaining to be answered. Through the application of scientific methods, a new project has the potential to unlock evidence that will allow researchers to determine answers to these questions. They will use a combination of cutting-edge scientific techniques, such as X-ray and infra-red reflectography. in order to reveal new informationabout individual paintings.