Blueprint

src: www.blueprinter.com

blueprint is a technical image reproduction, documenting architecture or engineering design, using the contact printing process on the light-sensitive sheet. Introduced in the 19th century, this process enables rapid and accurate document reproduction used in construction and industry. The blueprint process is marked with a colored line on a blue background, negative from the original. This process can not reproduce color or gray color.

A variety of basic materials have been used for blueprints. Paper is a common choice; for molds that are more durable, sometimes used, but over time, linen prints will slightly shrink. To solve this problem, print on imitation vellum and, later, a polyester film (Mylar) is implemented.

This process has largely been replaced by the diazo-white printing process and by large-scale photocopier photographs, so the reproduced image is usually called "mold" or simply "image".

The term blueprint is also used less formally to refer to any plan (and even more informally, any type of plan).

Video Blueprint

Process blueprint

In 1861, Alphonse Louis Poitevin, a French chemist, discovered that ferro-gallate in gom was light-sensitive. Light turns this into a permanent, non-soluble blue. This chemical coating on paper or other base can be used to reproduce images from translucent documents.

Ferro-gallate is coated onto paper from aqueous solution and dried. The coating is yellow. In the dark, it was stable for up to three days. It is clamped under glass and light transmission documents in a daylight exposure frame similar to a photo frame. Frames placed in the daytime take a minute or two under a bright sun or about ten times under a cloudy sky. Where an ultra-violet ray transmitted layer converts to a stable blue or black dye. Images can be seen forming. When a strong image is seen the frame is carried indoors and the unmodified layer, underneath the original image, drifts. The paper is then dried.

The result is a copy of the original image with a clear background area that is dark blue and the image is reproduced as a white line. Stable image. The contact printing process has the advantage that no large field optical systems are required. A further advantage is that the reproduced document will have the same scale as the original. Another quality is that dark blue backgrounds make it difficult to add new information to prints (like recording made changes); the blueprint can not be changed easily - depending on the situation, it can be a force or a weakness. Since paper is immersed in liquids during processing, small scale changes can occur, and paper can also become brittle. Technical drawings are often marked to remind users not to rely on reproductive scales.

Other blueprint processes based on photosensitive iron compounds have been used. The best known is probably the process of using ammonium ferric citrate and potassium ferricyanide. In this procedure, blue compounds are clearly formed and this process is also known as cyanotype. The paper is impregnated with ammonium iron citrate solution and dried. When the paper is illuminated, the photoreaction converts the trivalent iron (iron) into divalent iron (iron). The image was then developed using a solution of potassium ferricyanide to form an insoluble ferroferricyanide (blue Belam identical to Prussian blue) with divalent iron. Excess ammonium iron citrate and potassium ferricyanide then drift.

This is a simple process for the reproduction of light transmission documents. Engineers and architects draw their designs on paper cartridges; this is then traced on tracing paper using Indian ink for reproduction whenever needed.

The introduction of the blueprint process eliminates the cost of photolithographic reproduction or the original hand-to-hand image search. In the 1890s later in the office of American architecture, the blueprint was one-tenth the cost of hand-traced reproduction. The blueprint process is still used for artistic effects and special photography, on paper and cloth.

Maps Blueprint

Blueprints replaced with whiteprints

Traditional blue prints have largely been replaced by modern printing methods and cheaper digital printing. In the early 1940s, cyanotype blueprints were being replaced by diazo prints, also known as white prints, which had a blue line on a white background; so these images are also called blue lines or bluelines. Other comparable dye-based prints are known as black stripes.

Diazo molds are still used in some applications but in many cases have been replaced by xerographic printing process similar to standard copier technology using toner on bond paper. More recently, designs created using computer-aided design techniques can be transferred as digital files directly to a printer or computer plotter; in some applications, paper is avoided altogether and work and analysis is done directly from the digital display. Another modern method of copying is the use of large format scanners. It digitizes an image which can then be printed with a large format plotter.

Because screen technology has advanced, the use of mobile devices, tablets, to see plans has increased significantly among modern construction companies. The software allows users to view and annotate electronic image files.

The traditional term "blueprint" continues to be used informally to refer to any type of image. Train engineers, architects, and designers just call it "picture" or "print".