Whiteprint describes a document reproduction produced by using the diazo chemical process. It is also known as the blue-line process since the result is blue lines on a white background. It is a contact printing process which accurately reproduces the original in size, but cannot reproduce continuous tones or colors. The light-sensitivity of the c...
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http://en.wikipedia.org/wiki/Whiteprint
(from the article `blueprint`) type of print used for copying engineering drawings and similar material. The name is popularly applied to two separate methods, more exactly ...
Found on
http://www.britannica.com/eb/a-z/w/33
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