I am also delighted by the discovery that all you need to recover the image from a daguerreotype too badly corroded to yield much—if anything—to the naked eye is a synchrotron. Specifically a synchroton capable of mapping the distribution of mercury particles on the silver-coated copper plate, but if you can get one of those, then like Madalena Kozachuk and her colleagues at the University of Western Ontario you're in business.
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Thank you for sharing this! ^_^