Nature Print Printing Paper, Sun Activated, 5 x 7 Inches, Pack of 40 This Nature Printing Paper enables young artists to create beautiful, frameable images. Provides permanent finished prints in minutes with the help of natural or man made objects. Develop the print in water for one minute after exposing it to the sunlight for 2-3 minutes. Included plexiglass sheet holds object being used for the print in place. Measures 5-1/2 x 7-1/2 inches. Creative, unusual images can be made in a few minutes, using natural or man-made objects Simply place the negative or flat object on the paper and expose to sunlight; after a 1-2 minute exposure, slip the paper into a tray of ordinary tap water for a minute, then blot dry The exposed areas turn a rich blue, with unexposed areas remaining white and middle tones appearing as shades of blue Bright indoor lights such as photoflood bulb can be used after testing to determine the correct exposure length