▁paper . ▁The ▁revers al ▁film ▁was ▁then ▁market ed ▁as ▁Ag fach rome . ▁ ▁These ▁films ▁use ▁Color ▁Develop ing ▁Agent ▁ 1 ▁in ▁their ▁color ▁developer . ▁ ▁Ag fac ol or ▁Neu , ▁called ▁simply ▁Ag fac ol or ▁after ▁its ▁prede cess or ▁had ▁been ▁retired , ▁was ▁the ▁German ▁response ▁to ▁Techn icol or ▁and ▁K od ach rome . ▁Like ▁K od ach rome , ▁introduced ▁by ▁East man ▁K od ak ▁in ▁ 1 9 3 5 , ▁the ▁new ▁Ag fac ol or ▁film ▁was ▁an ▁" integr al ▁tri pack " ▁with ▁three ▁differently ▁color - sens it ized ▁em ulsion ▁layers . ▁Un like ▁K od ach rome , ▁the ▁corresponding ▁color - form ing ▁d ye ▁cou pl ers ▁were ▁made ▁integral ▁with ▁each ▁layer ▁during ▁manufact ure , ▁greatly ▁simpl ifying ▁the ▁processing ▁of ▁the ▁film : ▁with ▁K od ach rome , ▁the ▁d ye ▁cou pl ers ▁had ▁to ▁be ▁introduced ▁one ▁at ▁a ▁time ▁during ▁a ▁very ▁complicated ▁development ▁procedure ▁that ▁required ▁special ▁equipment ▁and ▁could ▁only ▁be ▁done ▁at ▁a ▁K od ak ▁processing ▁plant . ▁ ▁History ▁of ▁Ag fac ol or ▁ ▁Development ▁ ▁Real izing ▁they ▁were ▁at ▁least ▁one ▁year ▁behind ▁their ▁American ▁compet itors , ▁German ▁techn icians ▁decided ▁to ▁ste er ▁away ▁from ▁K od ak ’ s ▁approach ▁to ▁capt uring ▁color ▁images ▁on ▁film ▁and ▁inv ested ▁in ▁their ▁own ▁technology . ▁Their ▁work ▁bore ▁f ruits ▁in