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I remember using the ammonia style copier around 10 years ago, it's all plan printers and large format photocopiers now though! That's if the plan even gets printed out! We email it to the client as a pdf and send that same pdf to the planners/ builders etc. Usually, only printing it to check for mistakes or to hand sketch ideas over the top. But that's just us, each firms different i guess.
I've got a large collection of the blueprint type plans at home awaiting inspiration too!

Mark Gerwing

The images you have there are bluelines, not blueprints. Bluelines were pretty easy to print, a fairly inexpensive machine in an architect's office and a few minutes of interns time.
Blueprints are whitish lines on a dark blue field and are usually far older. The technology for printing bluelines replaced the even more toxic blueprint printing.
In each case the source paper was light sensitive, especially the blueprint paper, and allowed for differing levels of blue depending on the thickness of the original material use for printing. Cutting and gluing multiple layers of semi-transparent vellum or mylar gave off beautiful results.

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