What are blue prints ?

zaveri

zaveri

@zaveri-5TD6Sk • Oct 26, 2024
So what are blueprints ? and how do they differ from an engineering drawing ? are these things the same thing, with the exception that the former is printed on some blue colored sheet or so ?
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  • Ramani Aswath

    Ramani Aswath

    @ramani-VR4O43 • Jan 28, 2013

    When we were students and during early days of work (1950-60s) drawings were actually made by hand on a translucent tracing sheets using Indian Ink. These were reproduced in an blue printing machine which produced a negative drawing with white lines on a blue background (hence the name).
    I have myself used one of these ungainly machines.
    It was also called ammonia prints. Some sheets will give sepia toned prints.

    Here is more info:
    <a href="https://en.wikipedia.org/wiki/Blueprint" target="_blank" rel="nofollow noopener noreferrer">Blueprint</a>
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