|  Tougher plant materials have to be boiled longer
      and sometimes with a caustic soda.  If a caustic is not needed, then
      it is best to not use it. 
       Straw  
        cornstalks  
        ferns  
        dead leaves  
        wildflowers   
      When using caustic uses rubber gloves and eye protection.   
      In general, do not exceed 1 T caustic to 5 liters of water.  If
        you use too little, you can always rinse and reboil.  If you use too
        much, the fibers could become damaged.   
      Plant must be washed after boiling to remove traces of the
        caustic.  Rinse for a minimum of 20 minutes, squeezing out water
        periodically.   
      Try to liquify part and not liquify part.   
      Try a meat grinder:  
        If grind before cooking, sometimes you can get a coarse sheet without
        liquifying, usually with these you still need to add some liquified
        pulp.   
      With very coarse paper having huge hunks of plant material, the paper
        is usually too fragile other than as a decorative paper for chine
        colle.   
      Absence of pulp can make a paper with holes that has an interesting
        woven effect. p31 
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