I have done it many times, with about one part baking soda, and 3 parts cocaine.. using at the very least a half G of good coke, down here its always fire in FL(if you know the right ppl). I have done this quite a few times, the first time attempting it being new to this process I used way to little coke and more soda than should've been used and fucked it up.. But once I learned from a professional veteran crack smoker how easy it was I learned the best way was to use a ratio of coke 3:baking soda 1. I used like 0.5 a G. put a third of that amount of soda in the spoon with it, put just enough water to make it a white, pastey looking substance (too much water can fuck things up), so like a few drops of water. Then take a lighter, with low heat(very important to use low heat), put it under the spoon taking it on and off so it doesn't get too hot, then once it started turning into more of a clearer more liquid looking substance and was bubbling, I drop ice water on top of it just small drops while holding the spoon over an ice cube at the same time... then it should come back in a solid rock, literally it will look like a pebble, if its anything like mine has come out.. There are obviously a few different methods different people like to use, that is mine though. I however, get such good crack already made that I have no reason to do this nowadays, it was only something I did when I only could get powder.. but it works unless your coke is all cut with like 10% purity or less.