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Cyanotype is a fancy word for a blueprint. It is a process used by architects, engineers, designers or anyone needing to reproduce a mechanical drawing which was made on tracing paper and exposed to the sun or a bright light source and washed as described. The process was common until the mid 20th century when a similar process was invented that would produce a black or blue line on white paper, still from tracing paper. Today such drawings are scanned and printed digitally.