Been through that situation too many times to no longer feel like an idiot for even attempting to alter it. Smoke crack, snort coke. If you want to make crack from coke thats fairly easy to do. If you find yourself with crack that your unwilling to smoke you can either relieve yourself of the crack through whatever method you find appropriate and use any resultant funds to "convert" the crack to powder or use any number of methods to shoot it. I presume if you are anti smoking crack your probably anti shooting crack as well so I wont bother with the conversion description to make it shootable. After numerous attempts Im of the opinion that unless I get an ounce of crack or more dropped in my lap for free I would never waste time trying to make it into powder again. IMO its easier to cook meth than convert crack to powder neither of which I recommend unless your organic chemistry knowledge is sound and you have experience in purifying the end product ala ethanol, methanol, acetone via jammons comment above to yeild crystals. Take it from someone who learned the hard way...following someones directions on how to do something of this sort isnt wise unless you understand WHY you do each step and what the ramifications of "accidents" may be. I know of no one who can do what your asking by getting advice on a forum and having at it. Davis and Jammon above are pointing you in the right direction as far as the theory goes but theres a lot more to actually doing it than you think and its not worth it at all unless you have a shit ton of it. Even then plan on splitting it up into 4 or 5 equal portions and assume you'll screw the first three or so up beyond recognition, get something close to what you were looking for with the next cpl and maybe or maybe not ever get it right. Best to just obtain it in the form you want to use it in. Think about the shit involved...anhydrous acetone (bake some epsom salts....as a clue to what went unsaid), ether, ethanol, muratic acid....then you plan on putting it in your body? Obviously these types of things can be done and are done by those with experience, but seriously, Id throw it in the toilet before I tried any of the actual conversion methods unless you have the background to do so without any question in your mind about whether your doing it right or not.