jan 15, 1842 - Cyanotype
Description:
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.Added to timeline:
Date:
jan 15, 1842
Now
~ 182 years ago
