Heres a Curio from 2008 to kick off the New Year! The Lumière - TopicsExpress



          

Heres a Curio from 2008 to kick off the New Year! The Lumière Brothers of France patented the process for making these color images, known as autochromes, in 1904. The process involved first dying microscopic grains of potato starch orange, green, and violet. These grains were then brushed onto a specially-treated glass plate along with orthochromatic gelatin bromide emulsion. When the glass plate was exposed to light, the starch grains acted as a color filter, producing a color negative image on the emulsion. A positive color glass plate could then be produced in the darkroom. It could be viewed by simply holding it up to the light or by projection as a slide. Autochromes were the first generally available color photographs and were made until about 1940. They remain rare, however. The Wisconsin Historical Society has just five of them. All are viewable on our website.
Posted on: Fri, 02 Jan 2015 20:50:19 +0000

Trending Topics



Recently Viewed Topics




© 2015