DUAL RESPONSE PHOTOSENSITIVE COMPOSITION CONTAINING ALKYL BENZENESULFONIC ACID AND ARENE SULFONAMIDE

Improved photosensitive compositions comprising A. an acid salt of a leuco aminotriarylmethane such as tris (4-N,N-diethylamino-o-tolyl)methane; B. a hexaarylbiimidazole such as a 2,2'-bis(o-chloro-phenyl)-4,4',5,5'-tetraphenylbiimidazole; and C. a redox couple containing (1) as an oxidant a polynuclear quinone absorbing principally in the 400-550 nm region such as 1,6-pyrenequinone, and (2) as a reductant an acyl ester of triethanolamine such as triethanolamine triacetate, a lower alkyl ester of a nitrilotrialkanoic acid such as 3,3',4''-nitrilotripropionic acid, trimethyl ester or their mixtures, ARE OBTAINED WITH THE USE OF AN ALKYLBENZENESULFONIC ACID TO FORM THE SALT OF THE TRIARYLMETHANE AND AN ALKYL ARENESULFONAMIDE PLASTICIZER. The improved compositions are effective color forming compositions useful in a variety of applications.