http://www.kunsthaus.ch/en/the-collection/conservation/examples-from-the-world-of-art-conservation/max-ernst/puttying-and-retouching/puttying-and-retouching-3/?redirect_url=title%3Dm%D0%A0%C2%A0%D0%B2%D0%201a%D1%161%D0%A0%E2%20ac!22%D0%2019%C2%A9thod

Kunsthaus Zürich

Puttying and retouching

Puttying and retouching

Damaged areas after fill-ins with chalk-based putty
Damaged areas after fill-ins with chalk-based putty