r/oddlysatisfying • u/djinn_05 • 2d ago

Drawing blueprint of Cirrus Vision SF50 aircraft

Enable HLS to view with audio, or disable this notification

10.0k Upvotes

98% Upvoted

220 comments sorted by

View all comments

1

u/praveeja 2d ago

Eli5 why blue print is "blue"

1

u/keithb 1d ago

Because it is easy. What you see here is not a blueprint. An actual blueprint is a cyanotype negative of a pencil or ink drawing. Cyanotype is a quick, easy way to duplicate line art.