\Car"bon process\ (Photog.)
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}.