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⁾

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⁾

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⁾

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⁾