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Experiment using lasers to remove grimy biofilm from Jefferson Memorial a success, USNPS reports

WASHINGTON — A high-tech method using lasers to clean a grimy black coating on the Jefferson Memorial’s dome has proved so successful, officials now want to give the rest of the monument a laser scrub-down, the National Park Service said Tuesday.

The park service partnered with the Chicago-based conservation firm Conservation of Sculpture and Objects Studio last month for a four-week trial run of the laser-ablation treatment.


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