Sieving leafs produce a little lower grade of hash, but very potent; all the same. Get most of the leaves by making foilage and resin glans britle. Place leaves in freezer for few hours to freeze. Remove them from the freezer, break them up over a sieve and rub the leaves slightly over the sieve. A good deal of greenish powder should slip threw the screen at that point, Next press the powder and use heat generated by friction to make pieces of hash.