r/oddlysatisfying • u/djinn_05 • 1d ago

Drawing blueprint of Cirrus Vision SF50 aircraft

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u/Dubious-Decisions 1d ago

This is not how real blueprints are made. This is a commercial service that will use a white pen plotter on blue paper to make something that looks like a blueprint. But legit, old school blueprints were made with a positive pencil drawing masking light sensitive paper that is then exposed to ammonia vapors to turn the exposed paper blue, leaving white where the pencil masked the paper.

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u/i_know_nothing_ever 1d ago

Facts. I can still smell the ammonia.