On the occasion of its 50th anniversary, the Museumsverein Kassel e.V. supported the restoration of Peter Paul Rubens' "Jupiter and Callisto." The support is an extraordinary example of appreciation for in-house expertise in a museum. The Museumsverein Kassel e.V. funded a conservator's position for one year. Christiane Ehrenforth, a painting restorer from Hessen Kassel Heritage, was released for the restoration of one of the main works in the collection thanks to the generous support. This allowed the extensive experience within the institution to be excellently utilized, and the work was carried out in the painting restoration department of Hessen Kassel Heritage.

Rubens painted this mythological motif of "Jupiter and Callisto" on a large oak panel in 1613. Several earlier restorations caused the painting to form strong "bark" in some areas. Additionally, the varnish, the top protective layer of a painting, had been significantly altered, distorting the original color scheme. Compared to other Rubens depictions, the painting appeared neglected and dirty. Christiane Ehrenforth invested around 1,062 working hours in the restoration of the painting. The main task was to gently dissolve the varnish under the stereomicroscope and remove later overpainting and retouching.

The topic of Jupiter and Callisto offers a good entry point into the gender discourse of the Early Modern Period and is an important component of the educational work at Hessen Kassel Heritage. The completed restoration also provided an opportunity to change the presentation in the Rubens Hall. For the first time on one wall, paintings by Rubens and his contemporaries are displayed in a Baroque hanging style, directly relating to each other.