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Why are all mechanical engineering drawings in blue?

Why are engineering drawings and mechanical drawings all blue?You probably know where the term blueprint comes from.In fact, the reason why these drawings are blue is because of the way they are drawn.These drawings are not drawn or printed, they are “posted”.Perhaps in the streets and alleys can always see some printing agency door posted with a blueprint and so on the signboard, referred to is this.

Blueprint paper, commonly known as “blueprint paper”, is a kind of chemical coating processing paper, which is specially used for all kinds of engineering design and machinery manufacturing. It is an indispensable article in production, scientific research and construction.
Architectural drawings in blue are a form of mass drawing in the days before computer graphics.
The drawings are drawn on transparent paper, called sulphuric acid paper, using a carbon pen.The purpose is to use a large number of drawings in the future to facilitate the use of “blueprint machine” to produce a large number of identical drawings.
The blue color on the drawing is the working principle of the “blueprint machine” ammonia fixing and photosensitive, without any other significance.
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