Cyanotype Print
The cyanotype is where the word blueprint comes from. Sir John Herschel invented it in 1842, and he was not trying to make art — he wanted a cheap way to copy mathematical tables. It was quickly adopted for reproducing technical drawings, and for the better part of a century an engineering drawing was literally a white line on a blue ground.
The chemistry is two iron salts: ferric ammonium citrate and potassium ferricyanide. Brushed onto paper and dried in the dark, the coating is sensitive to ultraviolet. Where UV strikes it, the iron is reduced and reacts to form Prussian blue, which lodges permanently between the paper fibres. Where something blocked the light, it washes away white.
No darkroom, no enlarger, no developer. Sunlight and water. It remains one of the oldest photographic processes still in everyday use.
Mapanganib na nilalaman
Ang blueprint na ito ay naglalaman ng mga mapanganib na proseso. Mag-log in at i-enable ang mapanganib na nilalaman sa iyong account settings upang makita ang step-by-step na mga tagubilin.
CC0 Pampublikong Domain
Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.
Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.