The most economical method of developing films

Almost everyone has a digital SLR era, there is a group of people stubbornly use a film recorder with life.

A friend of mine once said : " Digital cameras record images is a physical change , while film recording process is a chemical change , love from my inner life , my physical activity is more of a chemical reaction , so I love the film . "

Film camera, the film does not say how to remove burn , one that washing, enlargements or scanning is a large sum of money.

Chong afford color negative or reversal film , we can punch their own black and white film , no money to do the film scanning , no space to engage in a darkroom enlargements, how should we do ?

Blue drying method is usually the first people encounter classical ( non-silver ) photographic process , because it is very simple and can be produced in a short time a successful pictures. This process is in the photographic technique " official" after the invention of the first three years , that is, in 1842 , John • Herschel , Sir (John Herschel ,1792-1871) invented this can produce persistent blue photo imaging processes.

The achievements of Sir Herschel far only that, he was " positive " , " negative " , " photography" , " Snapshot " and other words of the creator. He also in 1819 , found that sodium thiosulfate role of dissolved silver chloride can be used as a fixing agent for silver halide photographic this discovery provides a great help.

I appreciate most is that he also invented the flower juice through experiments print method: using crushed petals , a little alcohol and 2-3 weeks of sunshine to imaging . He was very romantic in his own book, describes it this way : flowers, wine ,2- 3 weeks of sunshine , just the three key ingredients for vacation .

Sir John Herschel first photochemical experiments, recorded : feeding coated ferric ammonium citrate solution and exposed to the positive image , so that after the use of potassium ferrocyanide solution development , and ultimately get the blue negatives. This is the classic cyanotype . Today we introduce is derived from this approach.

Sensitizer mainly by the sun's ultraviolet light exposure. Photo of Blue is ferric ammonium citrate and potassium ferricyanide mixed solution of divalent iron ions after lighting a result of oxidation , generating a very unique Prussian blue tones trivalent iron cyanide .

Cyanotype photographs produced very stable, but the quality will decline alkaline substances . Photos by the strong sunlight will fade, but after a short time in the dark or photo effects software can resume.