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1970

Cross braces are added to the Mona Lisa to help to keep the panel from warping further. The beech crosspieces are switched to maple after it is found that the beechwood has been infested with insects.

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1976

6 years, 1 day later

Died

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1977

1 year, 1 day later

A new insect infestation is discovered in the back of the panel of the Mona Lisa as a result of crosspieces installed to keep the painting from warping. This is treated on the spot with carbon tetrachloride, and later with an ethylene oxide treatment.

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