Diazo Process

diazo process

[dī′a·zō ‚präs·əs]
(organic chemistry)

Diazo Process


the production of images by means of photosensitive materials based on diazo compounds of the diazonium salt type. Diazonium salts are destroyed on exposure to light and form colored compounds (azo dyes) upon interaction with amines and phenols. The diazo process is used extensively for copying blueprints.


Katushev, Ia. M., and V. I. Sheberstov. Osnovy teorii fotograficheskikh protsessov, 2nd ed. Moscow, 1954. Chapter 18.
References in periodicals archive ?
The Diazo process requires an ammonia-based chemical, which complicates its use within enclosed areas and makes cleanup in the field difficult.
The diazo process differs from traditional blueprinting, which creates a white image on a blue background (see page 122 of the November Sunset).
The Oce 9800 was the breakthrough device that converted the reprographics industry from an analog diazo process to a digital plain-paper process.