ive been smoking BHO for 8 years, long before i knew how to make it clean, my lungs are immaculate
stop being child afraid of what you dont understand***
residue is normal,as most do not winterize their oil now go google that asshat and you will know all you want, and in response to your disdain to my comedy . . .beggers cant be choosers . . i learned by reading and doing not by asking for the easy button, in the end its up to you to decide what is smokeable and not, more black residue and ash on TI is bad a little mark left where dab went on a hot TI jsut fine(lipids aka plant fats)