Lasers are turning out to be handy tools for restoration. Last year a new high-precision beam was used to clean Verrocchio's statue of David in Florence. Now Italian archaeologists have used a new underwater laser technique to restore some 3500 Roman coins found accreted together in a block off the coast of Italy 2 years ago. The water prevents the laser from melting the coins, and the laser's heat produces bubbles that act as "microhammers" that knock off gunk.
Science. ISSN 0036-8075 (print), 1095-9203 (online)
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