Abstract
When the sulphuric esters of leuco vat dyes are developed with acidic nitrous acid solutions in the complete absence of oxygen, the sulphate groups am removed only by hydrolysis; the resulting leuco dye is then oxidised by nitrous acid. When oxygen is present development is far more rapid, the majority of sulphate groups being removed by direct oxidation with hydroxyl radicals via a chain mechanism. The chain reaction is initiated by hydrogen peroxide (or HO2 radical) and propagated by the homolytic fission of pernitrous acid and its re‐formation from nitrogen dioxide and nitrous acid. This mechanism is thought to operate in normal development. A modification of the technical development process is suggested.
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