uhm.
wash your crystals down with acetone (from wal mart)
do this by pouring goods into coffee filter, pour acetone over. cleans out impurities. (will be minor loss of product)
place dried goods into small glass something or other.
pour methanol (In a yellow bottled labeled HEET in your automtive section, gas line antifreeze) into this, stir until dissolved. place in the fridge or freezer to slowly re-crystalize.
this may be flawed.
if interested, let me know and ill make 100% that this method works.
you know, by asking SWIM.
-j.