technology of the noble compression matters goes back to the 40's
19th century, in which the first negativ/positive process was
developed by Henry Fox Talbot.
The process of the Cyanotype was discovered 1842 by Sir
John Herschel. The Cyanotype was the third photographic process
(after the Daguerreotype and the Talbottype/Calotype), which within
2 years (1840 - 1842) was discovered, and it was the first silverless