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acid activity adjustable agitation and/or archival quality artifacts average bromide calibrated cassette cause Check chemicals chemistry clean components contrast control charts crossovers crystals darkroom density developer Dmax Dmin drain dryer electrical emulsion exposed exposure factors feed tray filter fixer function gears gelatin guide shoes H&D curve hardener heat heaters humidity hydroquinone hypo inches increase indicates inspect installed latent image light manual measured meter mixing valve motor normal oxidation phenidone plastic poppet valves pressure problem processing processor produce pump quality control rack radiation radiographic Record reduce reducing agents remove replenishment rate replenishment tank rollers safelight screen sensitometric Shewhart silver halide silver recovery sodium sulfite solution speed point starter step storage switch technician technologist temperature test film thermometer thermostat thiosulfate trend chart troy ounces tube underreplenishment unit usually variables view box visible image wash