Diazo Sensitizers.

Since the war, considerable interest has revived in the use of diazo compounds as image forming materials and as substitutes for bichromated plate coatings in Lithography. This paper briefly reviews (1) some of the diazo materials, (2) the early patents of Kalle and Company of Germany, and (3) some of the work on diazo surface and deep-etch processes at the Lithographic Technical Foundation.