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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.
Bleach dyed shirts - so cool. Tips to remember for next time - 100% cotton gives best results versus blend. Check local thrift stores for cheap shirts. Michael's also usually has a 5 for $10 sale around 4th of July. Mist shirts from several feet above if using spray bottle. Paint any design with brushes.
And finally, a supremely easy cover-up made from an old t-shirt and bleach. | 25 Awesome Swimsuit DIYs You Have To Try This Summer