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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.
I typically start with a line drawing. I use both light/airy lines and bold lines throughout my sketch.Then I use my brush to dissolve those lines (much of the time I use a water brush), I pull pigment away and then use that pigment to shade, add contrast and bring my line drawing to life.
”As an aside, bleach will continue to damage and eat through your shirt over time, so holes will eventually start to appear – if you don’t want that to happen, you can soak your shirt in white vinegar after you wash it to help neutralize the effects of the bleach.