1) Cation 2) Containing the diazo group 
Diazo refers to a type of organic compound called diazo compound that has two linked nitrogen atoms (azo) as a terminal functional group. The general formula is R2C=N2. The simplest example of a diazo compound is diazomethane. The electronic structure of diazo compounds involves a positive charge on the central nitrogen and negative charge distrib...
Light-sensitive coating on paper or film for making contact prints of technical drawings.
Direct positive proofs made by contact exposure to film positives, can be made on paper or film.
[adj] - relating to or containing diazonium
adjective relating to or containing diazonium
A light sensitive coal tar product used as a coating on presensitized plates, as well as overlay proofs.
containing the diazo group.