I have successfully extracted the oil many times but I am just recently trying to rotate all the lesser cannabinoids and cannabinols into thc and the existing thc into the most active isomer, delta-9-thc. I need to know if the oil that I have been extracting the butane way is pure enough to skip the ether purification step and go right to the sulfuric acid isomerization part? Anyone out there know what I am talking about?