Cyanotype and Diazotype blueprints
Diazotype blueprints (light background, dark lines) began to taking over from Cyanotype blueprints (dark blue background, light lines) around 1935 thru 1950. It remained the dominate form of reproduction for engineering plans until the 1990s when large format copy machines began to take over.
This collection contains diazotype blueprint representations of all or parts of the following sets
This collection contains cyanotype blueprint representations of all or parts of the following sets
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