LESSON 1
After 30 seconds, onefourth of the hypo remains, and so on, until
eventually the remaining hypo is negligible. Accordingly, washing time
depends on the degree of agitation and the amount of fresh water coming into
contact with emulsion (fig 19). Where water shortages exist, the reduced
wash time will save large amounts of water.
Figure 19. Rate of hypo elimination from a negative
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