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acid amateur angle aperture blue bromide c.cm carbon 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 diffused distance effect electric electronic emulsion enlarger equipment exposed exposure filter flash focal length focus focusing frame gelatin give glass grain grams graphy green hydroquinone hyperfocal distance illumination lamp layer lenses light source London magenta ment method metol mounted movement normal optical ounces panchromatic paper photographic picture plate positive potassium potassium bromide produce projection projector rays recording reproduction reversal reversal film scale scene screen sensitized materials shadows sheet shot shutter silver halide Sodium Sodium carbonate Sodium sulphite soluble solution speed spool studio subtractive colour suitable surface tank technique tion tive tone transparency tube usually yellow