"Cyanotype is a 180-year-old photographic printing process that produces a rich, monochromatic Prussian blue image. Discovered in 1842, it relies on light-sensitive iron salts—ferric ammonium citrate and potassium ferricyanide. When exposed to UV light (such as direct sunlight) and rinsed in water, it leaves a striking blue print." - WikipediaAka, cyanotype is a 2 part iron salt combination that, when exposed to UV light like the sun, creates a blue print. I dip my articles in a bowl of water and iron salts, squeeze out the extra liquid, lay it out in the sun to piece together a design on top with plants , let it activate for 10 minutes, then rinse immediately so light doesn't activate the parts I covered and want to keep white/uncolored. I then machine wash each piece on cold to get any remaining color out!