User Tools

Site Tools




Sepia staining increased the longevity of photographs. It required additional chemical processes when developing black and white photographs. The goal was to replace the silver with a dark sulfur compound that is much more stable. 1)

Red-eye effect

In blue-eyed people, the red-eye effect is more visible in photography. Although the iris does not play a role in the red-eye effect - because it is light reflected from the bottom of the eye - blue-eyed people also have less melanin in this part of the eyeball. 2)


Cyanotype is an old photographic technique that produces blue prints using the photosensitivity of iron salts. It is characterized by a monochromatic blue image created by Prussian blue. Invented in 1842, it originally produced a negative image and was used in this version in reprography until about the middle of the 20th century. 3)

View from a window in Le Gras

Nicéphore Niépce took the first recorded photograph in 1822, but it was unfortunately destroyed. The oldest still extant photograph was taken around 1826 and was called “View from a window in Le Gras” (La cour du Domaine du Gras). The image was captured in Saint-Loup-de-Varennes and shows the roof and surrounding grounds of the Le Gras estate. 4)

Drawing with light

The word photography comes from Greek photos (“light”) and graphe (“drawing”). The term was first used by Hercules Florence, a French painter, and inventor when describing the technique of taking photographs in his diary. 5)

photography.txt · Last modified: 2021/08/10 04:53 by aga