Note:  Do not rely on this information. It is very old.


Fluotype, a photographic printing process, invented by Robert Hunt in 1844, in which paper, coated with a solution of potassium bromide and fluoride and sensitised by silver nitrate, was employed. After exposure to light, the image was further developed by a solution of ferrous sulphate. It is not much used at present, but is interesting as being one of the early printing processes.