The recent authentication of a painting by Leonardo da Vinci, for example, magically added several zeroes to the value of a work that had not, physically, changed in any way.
The portraits which were authenticated after extensive scientific analysis undertaken at Amsterdam's Rijksmuseum are expected to sell for between six and 10 million dollars.
They tried using a complex X-Ray machine at a hospital but the images they got still weren't conclusive enough to declare the painting a true Van Gogh.