To convert a coca plant into powder cocaine is a long process that goes like this:
First you pick the leaves and press them into a large steel tub about 3x5 feet square and a foot deep, you then fill this tub with kerosene or a similar product (even gasoline), you then mash the whole goo down constantly either with presses or some poor bastard peasants feet. After doing this for some time you will have about 2 inches of white paste in the bottom of your tub. You then put a large weighted piece of wood or metal on this and allow it to dry. The end result is about a one inch thick layer of pure uncut cocaine (takes about 6 weeks). Pinkish white if kerosene was used and more brownish white if gasoline was used.

Dont try this at home