I was told this before when a friend wanted letters at camp. He said to get a lasagna dish, clear, and add 1 oz meth to it. Then heat some isopropyl alcohol in the microwave till its warm and pour it in the dish till it dissolves everything fully with a little extra. Then start dipping sheets in. It's supposed to be a specific kind that is high cotton or fiber or something that won't diffuse like tp with liquids but not too thick. You dip sheets in 1 at a time, let them sit for a few seconds, then pull them out and hang them from a clothes line type device so they drip dry. Doing like 5-8 at a time so you can also flip the hanging ones on the line so that they then drip from the opposite direction. Keep using the alcohol till its gone and you can experiment with ironing the sheets if they get too warped but with a barrier as to not heat them directly. I'm recalling this from the letter he mailed, I'll see if I can find it.