restoration

The charity said it showed the importance of habitat restoration, because good weather alone is not enough to reverse decades of decline.

It said it had suffered years of "damp, decay and structural deterioration" and required extensive repair and restoration.

The investigation after October's heist found the museum had spent significantly more on buying new artworks, but far less on maintenance and restoration.

"We are making every effort to achieve full system restoration as quickly as possible, while implementing measures to prevent recurrence and strengthening information security across the group."

Pascal Perrin, an art historian and Renoir expert, lauded the "exceptional condition of the work, which has undergone no restoration" while presenting the canvas.