A reverse-glass painting The Baptism of the Ethiopian Eunuch  by Gerhard Janssen. The history and conservation of the work
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Keywords

Gerhard Janssen
reverse-glass painting
Karl Eusebius von Liechtenstein
Jan Gillisz. van Vliet
Rembrandt
the baptism of the eunuch
Liechtenstein collections

Abstract

The paper presents a large-scale reverse-glass painting discovered in 2018 in the depository of the State Château of Valtice. Signed by Gerhard Janssen (1636–1725) and dated 1677, the work depicts the baptism of the Ethiopian eunuch by Philip the deacon. The study situates the painting within Janssen’s oeuvre and identifies its graphic source as a 1631 print by Jan Gillisz. van Vliet after Rembrandt. This identification explains the exceptional quality of the Valtice painting, which stands out among Janssen’s known works. The print was transferred onto glass with remarkable precision, including close correspondence in scale. Janssen employed the églomisé technique on a glass panel measuring 56,5 × 52,8 cm, combining brush drawing in brown and dark red tones with translucent glazing, linear detailing, and incision into the paint layer. The background was fully backed with gold leaf.

When discovered, the painting was in poor condition, with detaching paint and gold layers and local losses. Conservation treatment carried out in 2019–2020 focused on consolidating the paint layers and restoring legibility and aesthetic coherence. After conservation, the work was reinstalled at the Château of Valtice. In the 1670s and 1680s, Janssen was in contact with Karl Eusebius of Liechtenstein, the château’s owner and an important art collector, who acquired the painting in 1677. The baptism of the eunuch is currently the only work that can be securely linked to Janssen’s activity in Liechtenstein service. The paper also addresses the technological and material aspects of the painting and summarizes its recent conservation.

pdf (Czech)

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