Abstract
A method is presented for calculating the rate at which water should be supplied for washing motion-picture film in both cascade and parallel types of immersion systems. Formulas are developed which show the relationship between water flow rate and the maximum concentration that can be expected in each tank of a wash system. Other formulas are offered which provide a measure of the rate at which the ultimate concentrations of contaminant are approached. Actual values of water flow rates, concentration of contamination, and contamination time are calculated for several typical wash systems from the formulas derived here. Conclusions arrived at by this theoretical treatment support the practice of washing film in several small tanks, rather than in a single large one.
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