2007-04-28 13:18:31 · 7 answers · asked by michael g 1 in Home & Garden ➔ Decorating & Remodeling
Blue prints are old technology that use a process similar to a photographic development. A yellow paper is rolling with the original drawing trough at luminescence light. The system use ammonia to make the imprint of the new copy. Today the name is used for xerox type copies that are black and white.
I have an old machine of blue prints in my office, is like a dinosaur.
2007-04-28 13:33:30 · answer #1 · answered by Lost. at. Sea. 7 · 2⤊ 0⤋
Originally the "copy process" which was similar to mimeography produced white on blue copies. If you are old enough to remember test day at school and the euphoric smell coming from the office, you have a sense of the blue in blue prints.
2016-05-21 02:48:42 · answer #2 · answered by ? 3 · 0⤊ 0⤋
To follow on from sailcat, the original prints from this system were blue, with white lines/writing. The technology moved on a bit, and switched to blue on white.
2007-04-28 21:11:36 · answer #3 · answered by lulu 6 · 2⤊ 0⤋
Their not always blue, it's pretty much an expression rather than a discription.
2007-04-28 13:22:37 · answer #4 · answered by josh03 2 · 1⤊ 0⤋
Not sure, but years ago you could not copy blue on the xerox, so maybe they were not to be copied.
2007-04-28 13:22:14 · answer #5 · answered by Nort 6 · 0⤊ 0⤋
origanally to make them easyer to read:) so you could design on the blue paper with chalk and erase:) but they are not always blue.
2007-04-28 13:26:22 · answer #6 · answered by Anonymous · 0⤊ 0⤋
because they r feelin mighty low.
2007-05-02 11:59:01 · answer #7 · answered by Anonymous · 0⤊ 0⤋