Fluorescence quenching method and novel cationic naphthalene-peri-dicarboxylic acid imide derivatives

摘要

The fluorescence due to anionic optical brighteners is extinguished using virtually colourless, water-soluble, cationic compounds which per molecule or per recurring structural unit contain at least one cationic group and per molecule at least two or per recurring structural unit at least one nitro-free naphthaleneperidicarboximide group or groups.