Crack cocaine is frequently purchased already in rock form, although it is not uncommon for some users to 'wash up' or 'cook' powder cocaine into crack themselves. This process is frequently done with baking soda (sodium bicarbonate), water, and a spoon. I can almost get pure freebase back, that's if you have good coke. The crack will still be pure, you'll just get less of it as the impurities don't turn into freebase, lol. Example, I had a gram of fishscale (very shiny, tiny crystals, that shiny characteristic it has.