Photographic film containing direct positive dyes made from 3-indolizine
申请人:E. I. Du Pont de Nemours and Company
公开号:US04701398A1
公开(公告)日:1987-10-20
A new group of cyanine and merocyanine spectral sensitizing dyes based on derivatives of 3-indolizine carboxaldehyde is particularly useful in sensitizing a direct positive silver halide emulsion to orange and red.