This 10 pack of 22cm x 28cm sheets of Cyanotype Pretreated Fabric by Jacquard makes producing Prussian Blue Monochromatic prints easier than ever before.Simply place object or film negative on top of fabric and expose to sunlight or UV.After exposure, prints should be processed in a tray of cool water and allowed to air dry.Cyanotype is an antique photographic process developed in the mid-19th century for reproducing photographs.Easy to use, these pre-treated fabric sheets are perfect for the classroom or as a group activity.Made in the USA.