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Cyanotype is a photographic printing process that gives a cyan-blue print. The process was popular in engineering circles well into the 20th century. The simple and low-cost process enabled them to produce large-scale copies of their work, referred to as blueprints.
Rejoice the soul of thy servant: for unto thee, O Lord, do I lift my soul up. Teach me thy way, O LORD; I will walk in thy truth: unite my heart to fear thy name. I will praise thee, O Lord my God, will all my heart: and I will glorify thy name for evermore. Psalm 86: 4, 11-12