The blueprint process is based on a photosensitive ferric compound. The best known is a process using ammonium ferric citrate See more

In most computer-aided design of parts to be machined, paper is avoided altogether, and the finished design is an image on the computer display. The computer-aided design program … See more

• The dictionary definition of blueprint at Wiktionary
• Media related to Blueprints at Wikimedia Commons See more

Traditional blueprints became obsolete when less expensive printing methods and digital displays became available.
In the early 1940s, cyanotype blueprint began to be supplanted by diazo prints, also known as whiteprints. This technique produces blue lines … See more

• Architectural reprography
• Cyanotype
• Floor plan
• Graph paper
• Heliographic copier See more