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The best known is a process using ammonium ferric citrate and potassium ferricyanide. The blueprint process is based on a photosensitive ferric compound. Practising engineers, architects, and drafters often call them 'drawings', “prints”, or “plans”.

The term blueprint continues to be used less formally to refer to any floor plan (and even less formally, any type of plan). It has almost entirely been replaced with digital computer-aided construction drawings. It was first largely displaced by the diazo whiteprint process, and later by large-format xerographic photocopiers. The process was not able to reproduce color or shades of grey. The blueprint process was characterized by white lines on a blue background, a negative of the original. It was widely used for over a century for the reproduction of specification drawings used in construction and industry. Introduced by Sir John Herschel in 1842, the process allowed rapid and accurate production of an unlimited number of copies. A blueprint is a reproduction of a technical drawing or engineering drawing using a contact print process on light-sensitive sheets.

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