Name of the process:
Cyanotype
Example:
Named for its blue color, this process was especially popular in engineering. Easy to make and low cost, they were used to reproduce drawings, and became known as "blue prints".
George Eastman House Video Series: Cyanotype
Date Range:
1840-1915
Negative Used to Create Image:
Yes
Materials Used:
8.1% (w/v) solution of potassium ferricyanide and a 20% solution of ferric ammonium citrate. Applied to paper or cloth. Dried overnight. Exposed in the sun. Washed with water.
Inherent Vice:
Blue image