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UNITED KINGDOM PRODUCTION OF PHOTOGRAPHIC
acid amateur angle aperture blue bromide carbon cell chemicals circle of confusion close-up coated collodion process colour film colour photography colour prints colour temperature contact printing contrast copying correct cyan darkroom daylight density depth of field developing agent diaphragm diffused distance effect electric electronic emulsion enlarger equipment exposed exposure filter flash focal length focus focusing frame front gelatin give glass grains grams graphy green hydroquinone hyperfocal distance illumination lamp layer lenses light source magenta ment meter method metol mounted movement normal optical ounces panchromatic paper photographic picture plate positive potassium potassium bromide produce projection projector rays record reflected reproduction reversal reversal film safelight scale scene screen sensitive material shadows sheet shot silver halide sodium Sodium carbonate soluble solution spool studio subtractive colour suitable surface tank technique tion tive tone transparency tube usually yellow