WEBVTT - What exactly is a blueprint?

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<v Speaker 1>slash stuff. Welcome to Brainstuff from house stuff works dot

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<v Speaker 1>com where smart happens. I am Marshall Brain with today's question,

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<v Speaker 1>what exactly is a blueprint? If you've ever watched a

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<v Speaker 1>house being built, or if you've ever had an addition

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<v Speaker 1>put onto an existing house, you know that the standard

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<v Speaker 1>method of communication is a big piece of paper called

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<v Speaker 1>a blueprint. Blueprinting is a way to copy large architectural

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<v Speaker 1>and construction drawings. A blueprint used to consist of white

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<v Speaker 1>lines on a blue background. More recent processes use blue

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<v Speaker 1>lines on a white background. The term blueprint is usually

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<v Speaker 1>used to describe two printing methods, the blueprint and the

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<v Speaker 1>diaze type. Blueprinting is the older method, invented in eighteen

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<v Speaker 1>forty two. The drawing to be copied drawn on translucent

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<v Speaker 1>paper is placed against paper sensitized with a mixture of

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<v Speaker 1>ferric ammonium citrate and potassium ferricyanide. The sensitized paper is

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<v Speaker 1>then exposed a light where the areas of the sensitized

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<v Speaker 1>paper are not obscured by the drawing. The light makes

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<v Speaker 1>the two chemicals react to form blue. The exposed paper

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<v Speaker 1>is then washed in water. This produces a negative image,

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<v Speaker 1>with the drawing appearing in white against a dark blue background.

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<v Speaker 1>In the diaze type method, the paper is light sensitized

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<v Speaker 1>with a mixture of diazonium salt used in the manufacture

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<v Speaker 1>of dyes, a reactant, and an acid that keeps the

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<v Speaker 1>salt and the reactant from reacting with each other. The

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<v Speaker 1>semi transparent original is placed on top of this sensitized paper,

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<v Speaker 1>and a copy of the same size as the original

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<v Speaker 1>is made by direct contact. Light destroys the salt. Ammonia

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<v Speaker 1>is used to develop after the exposure. It neutralizes the

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<v Speaker 1>acid and allows the remaining salt to combine with the

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<v Speaker 1>reactant to form the blue dye. The chemicals on the

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<v Speaker 1>paper acquire color only in the areas not exposed to

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<v Speaker 1>the light. This diaze type method produces dark lines on

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<v Speaker 1>a white background, and it's a popular method used today

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<v Speaker 1>for reproduction of large format drawings. The reason people still

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<v Speaker 1>use blueprints is because it's an inexpensive process, but large

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<v Speaker 1>format printers and copiers are getting cheaper and cheaper, and

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<v Speaker 1>they'll eventually replace blueprints completely. For more on this and

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