Which architectural documentation method was invented in the 19th century and named for its distinctive blue background with white lines?

The architectural industry relies heavily on precise technical drawings and specifications, but the history of how these documents evolved is fascinating. One particular innovation revolutionized how architects communicated their designs to builders and clients alike. Test your knowledge about the origins of one of architecture's most fundamental tools!

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Blueprints, created in 1842 using the cyanotype process developed by Sir John Herschel
Blueprints, created in 1876 using the ferro-gallate process developed by Louis Ducos du Hauron
Blueprints, created in 1901 using the diazo compound process developed by Gustav Kögel
Blueprints, created in 1821 using the lithographic process developed by Alois Senefelder