Chromogenic mixtures

Details Chromogenic mixtures Chromogenic mixtures

B - Operations, Transporting

41

M

42/13

B41M 5/145 (2006.01)

Patent

CA 1241838

ABSTRACT Mixtures of chromogens are disclosed for use in carbon- less copying systems which include three different chromogens, at least one of which is a substituted 6'-diethyl amino fluoran. These mixtures do not display the known antagonism of these chromogens when used in conjunction with a zinc modified phenolic resin coated sheet as the bottom sheet on which a black marking is required.

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