diazotype

noun
di·az·o·type | \ -ˌtīp \

Definition of diazotype 

: a photograph or photocopy produced on a surface (as paper) by coating with a solution containing a diazo compound that is decomposed on exposure to light, the compound in the unexposed parts being then converted to a colored image formed by an azo dye by developing especially with an alkaline solution or gaseous ammonia

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History and Etymology for diazotype

diaz- + -type

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