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Use foil underneath, draw with bleach pen, wait 30 minutes then wash. Great for writing words!!
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
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.