Making paper teaches children how one of our most ubiquitous materials -- PAPER -- is made, and it's also a fun sensory project for kids of all ages.
Screen (we bought a $10 sliding window screen)
Washcloth/rag/burp cloth/large piece of felt
Torn paper from newspaper, tissue paper, magazines, etc. Be sure that it's staple and tape-free
Small seeds (optional)
Shred the paper up into little pieces (roughly 2" square)
Add paper to the blender, cover it with water, and run the blender on a low speed. Since you'll squeeze all the water out of the paper pulp, you can't really have too much water, so if the blender doesn't move easily, add more water.
Run the blender a little bit faster until you get the paper mixture into a nice, smooth pulp. Add more water if your pulp is still chunky.
Spread the pulp in a thin and uniform layer across the screen
Cover this with a rag or cloth diape to absorb the extra water, while also pushing the water through the screen into the tub.
Place one hand firmly on top of the cloth and then flip the screen over onto a work surface.
Removed the screen and put the cloth plus paper pulp in a spot where it could dry, undisturbed, for about a day. The thicker the paper, the longer it will take to dry.
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Recipe by TinkerLab at http://tinkerlab.com/how-to-make-paper/