Oct 11, 2021 · Diazotype is an imaging technique which was used until the 90s of the 20th century for producing copies. From the chemical point of view, this technique is based on the photosensitivity of diazonium cations and the synthesis of azo dyes.

Whiteprint describes a document reproduction produced by using the diazo chemical process. [1] . 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 that accurately reproduces the original in size, but cannot reproduce continuous tones or colors.

A printmaking technique initially developed as an alternative to the blueprint, which it ultimately replaced, for the reproduction of maps, plans, etc. An image is projected onto paper that has been photosensitized with diazonium salts, and then developed with photographic chemicals.

May 8, 2019 · The diazotype process is known by several names including diazotype, ozalid, and whiteprint, and can be found in many colors ranging from magenta, maroon, brown, yellow and violet to black or blue. The most common substrates are fiber-based papers, but diazotype can also be printed on tracing cloth, vellum, and synthetic supports such as polyester.

The meaning of DIAZOTYPE is a photograph or photocopy produced on a surface (as paper) by coating with a solution containing a diazo compound that is decomposed on exposure to light, the compound in the unexposed parts being then converted to a colored image formed by an azo dye by developing especially with an alkaline solution or gaseous ammonia.

Diazotype. Discovered late in the 19th Century, diazo copies largely replaced blueprints. Sensitized paper and translucent original drawing are exposed to light and ammonia gas. Diazo is inexpensive but unstable. The diazo microfilm process, however, may be stable.

Nov 29, 2021 · Diazotype is a historical light tracing process which was used, in particular, for reproducing technical drawings. This paper first explains the principle of the diazotype. Thereafter, a researching and developing teaching concept with a varity of newly developed experiments is presented for chemistry lessons at secondary level II.

May 5, 2021 · Diazotype is a whiteprint technique that has been utilized for copying of engineering drawings until about 1990. It makes use of the photosensitivity of diazonium salts and azo coupling. The article first provides a brief explanation of the basics (functionality) of diazotype.

Nov 28, 2021 · Diazotype is a historical light tracing process which was used, in particular, for reproducing technical drawings. This paper first explains the principle of the diazotype. Thereafter, a researching and developing teaching concept with a varity of newly developed experiments is presented for chemistry lessons at secondary level II.

There are several good reasons for the diazotype’s overwhelming commercial success and great appeal for the architect or engineer in the 20th century. They were simple to produce, inexpensive, offering speed, efficiency, and the ability to reproduce any number of copies from a single run. Dry processing ensured no dimensional change.