There is an "Artwork Details" feature and in it a section "Paint residues from the act of vandalism", they are remnants of the act. I quote:

> The varnish applied in 1962 served as a layer to protect the polychrome and the red paint could be removed without damaging the original.

> At the present time, macrophotographs show reddish micro-residues, almost imperceptible to the naked eye. In some cases, this has entered the fissures.