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The camera first appeared in Europe. The first camera obscura was a darkened room with a convex lens inserted in one wall. The image or scene outside the wall passed through the lens and was projected on the opposite wall inside the room in color.
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The camera obscura had shrunk to the size of a portable box. A mirror reflected the image onto a horizontal ground glass surface
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Was discovered when certain silver salts were exposed to light they changed color. He dissoled a mixture of chalk and silver in nitric acid and place this combination in a clear glass container. Wherever light struck the liquid mixture, the mixture changed from white to dark purple
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His technique was complicated and expensive
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