Carbon Process

A printing process depending on the effect of light on bichromatized gelatin Paper coated with a mixture of the gelatin and a pigment is called carbon paper or carbon tissue This is exposed under a negative and the film is transferred from the paper to some other support and developed by washing the unexposed portions being dissolved away If the process stops here it is called single transfer if the image is afterward transferred in order to give an unreversed print the method is called double transfer