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1.
It is also known as the blue-line or blue-line process.
There are two components in this process:

1. the diazonium salt: a light sensitive chemical

2. the azodye (AKA coupler): a colorless chemical that combines with diazo to produce color
Diazo is the process equal the Blueprint ,which is commercial terminology
by Eccko June 03, 2010
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