Jacob Por painted this ceiling mural on the barrel vault of Sint Agathakerk (Agathatsjerke) in Oudega in 1922. It was a time when the Ploeg painters traveled through the Groninger countryside and painted their colourful expressionist paintings around Blauwborgje. It was also a time when excavations were conducted in Egypt. 1922 is also the year when the tomb of Tutankhamun was discovered. 

Art Deco painting

The painting by Jacob Por in Sint Agathakerk consists of Art Deco repeating motifs in cream and black on a burgundy background between green-colored ribs.

Jacob Por in Agathakerk

The barrel vault in Sint Agathakerk

Jacob Por in Sint Agathakerk
The barrel vault seen from the organ.
signatuur of jacob por

Jacob Por’s signature is written; did he paint this decoration alone, or were there collaborators? And how is it that a component of nicotine has been found in the binder samples? Por smoked cigars… Could that be the reason? Because at the entrance of the church, there is a sign that says, ‘Smoking and tobacco prohibited.’ Many questions still unanswerd… The old villagers can tell that Por used to stay in the village at that time.

The investigation into technique and material usage by Jacob Por.

The semi-transparent reddish-brown layer contains not only oil but also protein and a bit of candelilla wax. The pattern is applied to it using a punching technique of white dots. The black and cream lines appear to be smoothly and gracefully executed. The cream paint is based on casein, and the black paint has oil and protein as binders. The brush strokes are attractive. Here, a lively and ingenious pattern has been painted with enthusiasm and skill.

Designs by Jacob Por

The grandchildren own beautiful watercolors by Jacob Por in Sint Agathakerk. The watercolour that served as a model for the church board of that time is almost identical to what we see now. However, the final design is even more ingenious in terms of the mirror image and reversibility of the pattern. You keep looking and discovering new patterns. 

Patterns and motifs

There is a balance in the number of planks, the width of the plank, and the brushstroke. A plank of 16 cm wide is used for brushstrokes and patterns that are 4 x 2 cm wide. This entire design is so ingeniously constructed that it becomes dizzying, especially because it consists of 18 compartments and 9 ribs.

Jacob Por in Sint Agathakerk
Mirror-image motifs between two adjacent compartments.

Lecture on the conducted research and the findings and recommendations

On November 24, 2023, I presented the results of our research (2022) to about 80 interested individuals, residents of Oudega, and 7 grandchildren. The research was conducted in 2022 in collaboration with Willianne van der Sar from Color & Conservation. The research questions and the corresponding samples taken by Willianne were answered by the Cultural Heritage Agency of the Netherlands (Rijksdienst voor het Cultureel Erfgoed – RCE) in a comprehensive report. 

Jacob Por in the New Church in Delft

In 2014, the ceiling painting by Por in the New Church in Delft was examined by Susan Smelt and me. Special similarities and differences in technique and materials could be observed here. Now, there is a desire to investigate a third church painting. This could help in building a small database.

Slow conservation

Thanks to all the acquired knowledge, this ceiling painting by Jacob Por in Agathakerk can now be preserved through proper management and conservation. Because the advice once again is ‘doing nothing is also doing something.’ We aim for condition monitoring and ‘slow conservation.’

Jacob Por

With a basis of highly detailed photographs by Ralph Kämena For the baseline measurement, along with a detailed damage mapping, we will get to work. The strategy is: observe and record, use climate loggers, collaborate with the church board. It cannot get any more beautiful, only better preserved!

Photography 0-measurement

Jacob Por
★ I like to share my knowledge of paintings and love for conservation with colleagues and clients ★

Share on Social Media

Table of contents

Follow Us

Last Posts:

Arthur Brand saves Spring Garden

Arthur Brand saves Spring Garden from the underworld! It is thanks to the investigation of the Central Netherlands Regional Unit and Arthur Brand that The Spring Garden, painted by Vincent van Gogh in 1884, is back in the Groninger Museum.  Behind the

Read more »
De lente tuin

Vincent van Gogh Spring Garden

Since January 2024, I have been researching the painting Spring Garden by Vincent van Gogh. In Dutch ‘Lentetuin’ and Vincent painted it in 1884. It lies in front of me on a table in the depot of the Boijmans van Beuningen museum. Because I have a microscope available there with which I can zoom in to look in detail and take pictures. Continue reading

Read more »

CROMA atelier for painting conservation

In this post I give a platform to Zoë Sallin, an intern in 2022 in the restoration studio. She started her own studio in France in 2023 under the name CROMA CROMA, acronym of Conservation Restoration of Old and Modern

Read more »

Jacob Por in the Sint Agathakerk

Jacob Por painted this ceiling mural on the barrel vault of Sint Agathakerk (Agathatsjerke) in Oudega in 1922. It was a time when the Ploeg painters traveled through the Groninger countryside and painted their colourful expressionist paintings around Blauwborgje. It

Read more »