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.
Ibirimo biteje akaga
Iki gikorwa kirimo imikorere yangiza. Injira hanyuma ufungure ibikoresho byangiza mu igenamiterere ryawe kugira ngo urebe amabwiriza.
CC0 Umurenge rusange
Iyi blueprint yasohowe munsi ya CC0. Ushobora gukoporora, guhindura, gukwirakwiza no gukoresha nta kwemererwa.
Shyigikira Umuremyi ugura ibicuruzwa binyuze muri Blueprint ye Komisiyo y'Umuremyi byashyizweho n'Abacuruzi, cyangwa kora verisiyo nshya y'iyi Blueprint ukayinjiza nk'isano muri Blueprint yawe kugira ngo musangire inyungu.