A photocopy made by a process in which a diazonium salt and coupler are present in the paper coating, so that the image develops in the presence of ammonia.
- The Ozalid print is opaque to reflected light but translucent to transmitted light so that it may be used either as a transparency or a bulletin board poster.
- A stack of photosensitive Ozalid paper was exposed for daily periods, and the amount of light energy received was estimated from the number of layers of paper that were bleached after dry development with ammonia vapor.
1920s: by reversal of diazo and insertion of -l.
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