Light Sensitive Materials
	• After the camera obscura had been invented and it’s 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