Viewgraphs, ContinuedExposure andThe exposure and development of diazo foils and papers are by trial anddevelopmenterror. The variables that effect exposure and development are thetranslucency of the master, the color foil selected, the age of the foil, theintensity of the light source, and the degree of saturation of the ammoniavapors. Once you make an acceptable exposure, write the exposure timedown on paper and keep it near. Refer to it for the basis of all otherexposures in that series of foils. When running multiple overlays forregistration on a master viewgraph, run all foils for that viewgraph in thesame direction to minimize the distortion caused by shrinkage or expansionfrom exposure to the heat of the light source.To expose and develop a diazo foil, use this table:StepAction1Remove a foil from its light-proof package.2Locate the manufacturer's nick and place it in the upper-left corneras you face the foil. This ensures that the emulsion side is up.3Place the master artwork either face up or face down on the foil.Emulsion to emulsion between art and foil results in images withthe least distortion.4Feed combined art and foil into the machine for exposure.Exposure is variable. Once you obtain the correct exposure, writeit down and use it as a basis for all other exposures.5The art and foil will exit the exposure section of the diazo machineand the machine will automatically separate the art into the forwardbin while the diazo foil continues into the development section.6Develop the foil only long enough to obtain maximum colorsaturation. In some cases, you may have to slow down the speed ofthe machine.7The developed foil exits the machine either to the top bin or the binin the back of the machine.Continued on next page2-41
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