Or lye. I think the process is a bit like making speed from Vick's Inhalers. Stinks the whole neighbourhood out.
but isnt it easy to miss the vain fully.
I suppose they're careful.
swelling and rotting later?
The problem is chemical residue left over from manufacture, impure water etc. You see some really scabby opiate addicts in town sometimes. Can't be an easy life.