15 gen 1842 anni - Cyanotype
Descrizione:
The Cyanotype is invented by Sir John Herschel A sheet of paper is brushed with iron salt solutions and dried in the dark. An object is then placed on the sheet in direct sunlight. After about 15 minutes a white impression of the subject formed on a blue background.Aggiunto al nastro di tempo:
Data:
15 gen 1842 anni
Adesso
~ 182 years ago
