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Speaker 1: slash stuff. Welcome to Brainstuff from house stuff works dot
Speaker 1: com where smart happens. I am Marshall Brain with today's question,
Speaker 1: what exactly is a blueprint? If you've ever watched a
Speaker 1: house being built, or if you've ever had an addition
Speaker 1: put onto an existing house, you know that the standard
Speaker 1: method of communication is a big piece of paper called
Speaker 1: a blueprint. Blueprinting is a way to copy large architectural
Speaker 1: and construction drawings. A blueprint used to consist of white
Speaker 1: lines on a blue background. More recent processes use blue
Speaker 1: lines on a white background. The term blueprint is usually
Speaker 1: used to describe two printing methods, the blueprint and the
Speaker 1: diaze type. Blueprinting is the older method, invented in eighteen
Speaker 1: forty two. The drawing to be copied drawn on translucent
Speaker 1: paper is placed against paper sensitized with a mixture of
Speaker 1: ferric ammonium citrate and potassium ferricyanide. The sensitized paper is
Speaker 1: then exposed a light where the areas of the sensitized
Speaker 1: paper are not obscured by the drawing. The light makes
Speaker 1: the two chemicals react to form blue. The exposed paper
Speaker 1: is then washed in water. This produces a negative image,
Speaker 1: with the drawing appearing in white against a dark blue background.
Speaker 1: In the diaze type method, the paper is light sensitized
Speaker 1: with a mixture of diazonium salt used in the manufacture
Speaker 1: of dyes, a reactant, and an acid that keeps the
Speaker 1: salt and the reactant from reacting with each other. The
Speaker 1: semi transparent original is placed on top of this sensitized paper,
Speaker 1: and a copy of the same size as the original
Speaker 1: is made by direct contact. Light destroys the salt. Ammonia
Speaker 1: is used to develop after the exposure. It neutralizes the
Speaker 1: acid and allows the remaining salt to combine with the
Speaker 1: reactant to form the blue dye. The chemicals on the
Speaker 1: paper acquire color only in the areas not exposed to
Speaker 1: the light. This diaze type method produces dark lines on
Speaker 1: a white background, and it's a popular method used today
Speaker 1: for reproduction of large format drawings. The reason people still
Speaker 1: use blueprints is because it's an inexpensive process, but large
Speaker 1: format printers and copiers are getting cheaper and cheaper, and
Speaker 1: they'll eventually replace blueprints completely. For more on this and
Speaker 1: thousands of other topics, is it how staff works dot com.
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