I haven't been able to source decent cocaine for a while, it seems to often have a bitter taste to it. Because of this I tend to do is covert it to crack cocaine. I heat it with water and baking soda until it stops bubbling, then put it in an ice bath. The crack floats to the top. However when I heat the crack the bitter taste remains, and if I heat it too vigorously it starts burning and leaves a orange or brown stuff behind. Does anyone know what this could be? I presume it is likely to be levamisole.