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Page 3 <br /> October 13 , ]972 <br /> causes stair, on film and equipment. Softening removes iron. Another <br /> alternative is to add a sequestering agent to "tie up" the iron. In <br /> that case the treated water must be tested for photographic effects. <br /> ti'e suggest that after installation of a machine it be tested by running <br /> variovs types of film for the purpose of observing stain. If stain <br /> occurs, the water should be treated. �+'e would then suggest that the <br /> iron level. be reduced to not more than 0.1 ppm before it is used for <br /> proce�sin};. <br /> �/ �;"�>o-tc..Pr�— <br /> � tI74Ca� S <br /> Thomas W. BoUer <br /> �� .��/��i,~, < - <br /> Thcmas J. Dagon <br /> T�di3/1'JD/smf <br /> 13/77 <br /> �r�;:�a;�'m":w:,�.-��q..q.= . —_- — <br />