http://www.kunsthaus.ch/en/the-collection/conservation/examples-from-the-world-of-art-conservation/auguste-rodin/stage-2/touch-ups/touch-ups-cupric-nitrate-and-sulfur-compounds/?redirect_url=title%3DOffres

Kunsthaus Zürich

Touch-ups

The cupric nitrate and sulfur compounds are applied directly on the bleak metal by means of a brush (Photo:  G. Pegurri)
The cupric nitrate and sulfur compounds are applied directly on the bleak metal by means of a brush
(Photo: G. Pegurri)