diazo copier造句

• :: : Then, later ( but still before Xerographic copiers ), diazo copiers came into use.
• Using the right compound some " cyano copiers " could be adapted to be used as " diazo copiers ".
• The different names " blue-line copier ", " whiteprint copier " or " diazo copier ", were given, due to the nature of the process, which consists in exposing to an ultraviolet light a previously sensitized paper with a component called diazo, and finally developing it in a bath ( a solution of ammonia in water ) which converts the parts not exposed to light, to a dark blue colour ( blue-line ) over an almost white background.