Sunprint paper goes through a chemical change when exposed to light. Place any object on the sunprint paper and set it in the sun briefly. Then rinse the paper in water and watch as a beautiful long-lasting image appears. Use your kit outside on a sunny or an overcast day or even indoors on a windowsill. Remember not to expose the paper to sunlight until you've followed the instructions. This kit contains contains 12 - 4x4 sheets and an acrylic overlay. We also sell the refill kit containing just the sunprint sheets. "