Use practically anything flat natural or man-made objects for permanent finished prints in minutes.Expose to sunlight for 2-3 minutes, then develop in water for 1 minute.Pack of 30 Sheets.Classroom-Tested for over 30 years and ready for use at home or school.Produces beautiful, permanent prints from natural or man-made materials.Unique sun-sensitive paper exposes in direct sunlight to create white on blue prints.Full simple instructions included.