Recrystallize in enough methanol to dissolve, then place in refrigerator for large crystals (4 days) OR freezer for smaller (4-8 hours). do multiple smaller pulls.
90ml acetone
10ml chloroform
1-2gm NaOH
Yield~ 4gm
Please note this is not safe for consumption. It may contain small amounts of un reacted chemicals or many possible side products.