Cyanotype is a photographic printing process that produces a distinctive blue image. It involves using a light-sensitive solution made from ferric ammonium citrate and potassium ferricyanide. When exposed to ultraviolet light, the solution undergoes a chemical reaction, resulting in a blue pigment known as Prussian blue. This technique is often used for creating prints from negatives or for making photograms, where objects are placed directly on the treated paper. Cyanotypes are popular in art and education due to their simplicity and the striking visual effect they produce.