In 1839, a Scottsman by the name of Mongo Ponton discovered the light sensitivity of potassium dichromate. Later in 1852 William Henry Fox Talbot noticed that soluble organic colloids such as gum arabic or gelatin became water insoluble when mixed with potassium dichromate and exposed to light. In 1864, Joseph Swan developed what is now called the carbon process using layers of pigmented gelatin sensitized with potassium dichromate. This mailing list is dedicated to those people who continue to practice and improve on this process.
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