Study: Yes, tapping on frescoes can reveal defects
Briefly

The use of laser Doppler vibrometry enables conservators to precisely identify delaminated areas in the Capitol building frescoes, facilitating more effective repairs.
Brumidi's frescoes are not only artistic treasures but are also facing preservation challenges, making innovative conservation techniques like vibrometry essential for their longevity.
Read at Ars Technica
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