CARBON
CARBON process, The
Print fading was a common occurrence in the earliest days of photography, and several people sought to address themselves to this problem. In the mid 1850s some began to experiment with carbon, and in 1864 Joseph Wilson Swan perfected the process, which he also patented.
Prints made using this process came in any colour, and were permanent. The sensitising solution consisted of a mixture of carbon, gelatin, the colouring material, and potassium bichromate. …
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…Precautions for Carbro Printing
· Use the least toxic bromide developer.
· Do not heat or add acid to sodium thiosulphate
· Wear gloves when handling dichromate sensitizer. Mix in a fume hood, glove box or wear an approved toxic dust mask.
· Avoid inhalation of pottasium bromide powders.
· Wear gloves when handling solutions during transfer and development of the carbon tissue to avoid skin contact with pottasium dichromate and pigment suspended in gelatin.
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