This sounds great! I'd call their listed ph # to find out how much alum to use, since it didn't say (alum is very bitter), & don't be disapointed if it comes out too brittle to roll. Should that happen, call them back & see if they can offer advice on making the paper more pliable, say you need it that way for origami. I've made rag paper for water color & other art. It's fun, BUT MESSY AS HELL! When you get a recipe down for this, I hope you plan to share! Would love to try it, but I'll let you iron out the kinks first. I'm lazy! ~~~PEACE! ~~~