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​​​ Special effects Color printing variations Ever since color materials were invented , include chemical after - bath treatment and photographers have sought creative ways of maltreatment of the print surface to encourage bending the scientifically accurate colors so the emergence of colors in the substructure of carefully built into the film and paper by the the paper , which can enliven a dull picture manufacturers . To abandon " correct " color frees you to explore new moods and styles and create unexpected results . If you choose to manipulate at the printing stage , you are not risking the safety of your camera originals and can therefore be uninhibited in your use of strange and unpredictable colors . ing are the simple weighting of enlarger filtration Among the treatments available after shoot and white prints , Successful results can also on color prints and chemical toning of black be obtained by printing transparencies onto non - reversible paper to obtain a negative used in a color enlarger to make single color result . Black and white negatives can also be prints on color paper . A more elaborate print system is the gum bichromate process , which is capable of exquisite results but requires a great deal of skill and care . Though planning is essential to the success of most photographic enterprises , there are some areas where chance can help to form your results . Nude pictures based on graphic power , rather than realism and charm , can be treated after exposure to produce results where strong , unrealistic color emphasizes the shapes and further depersonalizes the image . you should consider other print manipulation The list is long and , if you are interested , techniques described in specialist books . It is not essential that you have darkroom or color processing facilities to achieve interesting results in this field . Black and white prints can be chemically toned in daylight and the better custom printing laboratories will enthusiasti cally co - operate in achieving the desired Color toning filtration effects with your negatives on the enlarger . Even instant pictures , such as Polaroid SX 70 , can be manipulated and their at times the technique allows reject prints to be put to image and colors dramatically altered . Methods I used a French chemical toning kit to produce this resun from an even - toned black and white print on sesin coated paper Though the results of toning can be unpredictable 50mm 1/60 sec at 15 : 6 , HPS good use at a later date