Light Sensitive Materials
After the camera obscura had been invented and its use
widely popularized, many dreamt of capturing the images
obtained by the camera obscura permanently.
For hundreds of years before photography was invented,
people had been aware that some colors are bleached in the
sun, but they had made little distinction between heat, air and
light.
Camera Obscura, Georg Friedrich Brander (1713 - 1785), 1769