Answer: diazo

AnswerCrossword Clue
diazoor relating to a photograph or photocopy whose production involves the use of a coating of a diazo compound that is decomposed by exposure to light
diazocontaining the diazo group
diazoa type of photocopy
diazorelating to or containing the group N2 composed of two nitrogen atoms united to a single carbon atom of an organic radical often used in combination