DIHYDROPERIMIDINE SQUARYLIUM DYES AS ANTIHALATION AND ACUTANCE MATERIALS FOR PHOTOGRAPHIC AND PHOTOTHERMOGRAPHIC ARTICLES

摘要

Dihydroperimidine squarylium dyes have been found to be particularly effective when used as acutance and antihalation dyes for photothermographic and photographic articles. The dihydroperimidine squarylium dye has the nucleus (I).