Cyanotype prints are a type of photographic print that turns images blue and white. This process was invented in the 1840s by a scientist named Sir John Herschel. To make a cyanotype, a special chemical mixture is painted onto paper or fabric, then objects or photo negatives are placed on top. When exposed to sunlight, the areas covered by the objects stay white, while the rest turns blue. After rinsing with water, the image is revealed. Cyanotypes are simple, safe, and popular for creating unique blue artwork.