Mourning portrait of female figure

Glass plate negative of a painting depicting a half-length portrait of a female figure. The sitter is seated in an armchair facing slightly to the left and gazes directly at the viewer. She wears mourning clothes and holds a little book in one hand. A bust of a male figure, possibly important to the sitter, can be seen in the background. 

The glass plate negative has been photographed showing the coated side and therefore the image appears laterally reversed. Prints from this negative do not seem to exist in the Collection.