15 gen 1878 anni - Photogravure is an intaglio printmaking or photo-mechanical process whereby a copper plate is coated with a light-sensitive gelatin tissue which had been exposed to a film positive, and then etched, resulting in a high quality intaglio print that can reproduce the detail and continuous tones of a photograph
Aggiunto al nastro di tempo:
Data:
15 gen 1878 anni
Adesso
~ 147 years ago