Step 2Start to Boil
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Fill your pot with water, don't be concerned with how much right now, and set it to a high boil. Wait until it gets simmering and tear off a long ribbon of toilet paper and start to tear it into tiny tiny tiny shreds. Mine in the picture below probably weren't tiny enough. A good size would be about as big as your thumb. It's a long process, yeah. Now after it's started to bubble a little bit and boil a little start to throw the little pieces in and just let them sit and soon some will start to tear apart because of the heat and the boiling and the wetness. DON'T put them all in at once! You'll get much better results if you slowly feed the tiny bits into the boiling water little by little and then slowly let them sit little by little and then this process also gives you time to tear up more pieces. Keep in mind that a little bit of paper mache pulp goes a long long way. If you're making something small like a mask then you may only want to use not even half of a roll of toilet paper depending on what embellishments you plan on making.
After you have thrown in the boiling water all that you want to throw in ... keep stirring and keep it in a hard boil for a while yet. The only advice I have for this is that just take it off when it looks right to YOU. When you think it seems the right consistency (not enormous clumps of toilet paper and most of it has torn apart into even tinier bits and it looks smooth) then take it off the stove.
WARNING!: while the pot is getting full and is boiling away it really likes to spit at you! You may want to take a step back while stirring.