The process of transferring printed pictures photographically is as follows. Place any printed picture, face downwards, on a sensitive photographic dry plate, expose freely to the light, and pass a warm iron over both plate and picture. The heat and the pressure will transfer, more or less successfully, the printed picture from the paper to the plate. Then immerse the plate in a bath composed of a saturated solution of ferrous sulphate 1 part and a saturated solution of potassium oxalate 3 parts. This bath will blacken all those parts of the plate that are not covered with the greasy printing ink. Rinse the plate in water; after which the plate must be rubbed over with a weak solution of ammonia and then placed in the fixing bath. From the negative thus obtained any number of copies may be made. Where only one copy is required the fixing is done first.