This article needs to be cleaned up to conform to a higher standard of quality. See How to Edit and Style and How-to for help, or this article's talk page.
Diazo is the common name for diazonium salts, which are light sensitive compounds. Like most other light sensitive compounds, such as silver nitrate and potassium dichromate, they are sensitive to ultraviolet light. Exposure to UV light causes the Diazonium salts to break down. Silver nitrate is a chemical compound with chemical formula AgNO3. ... Potassium dichromate, K2Cr2O7 is used in oxidation reactions. ...
Diazonium salts may be combined with azodyes, which form a dye by coupling with the Diazo salt.
This property of Diazo salts led to their usage in document reproduction. In this process, paper or film was coated with Diazo salts. After contact exposure under UV light, the paper was exposed to ammonium hydroxide vapors. It was then coated with an azodye, resulting in a dye image. Ammonium hydroxide (NH4OH) is a name sometimes given to an aqueous solution of ammonia. ...
Lithographic plates are sensitive in the UV regime; ~365 nm for photopolymer and ~400 nm for diazo coatings.
When the diazo coating is exposed to light in the 400-410 nm range, the triple bonded nitrogen in the diazo group is split and released as N
The exposed diazo material forms a durable ink-receptive image area which is insoluble in the developer (usually a aqueous mixture of alcohols and surfactants).
Feeds |
Contact