Here ya go!
This is nice:
1. Treat your stuff as if it were a volatile solvent or critical fluid extraction.
2. With the remaining resin, dissolve it in a non-polar solvent. Be sure to use one that separates easily from water such as naphia or white gas.
3. Treat this mixture with sulphuric or hydrochloric acid until a pH around 1-2 is reached (approximately one drop of concentrated acid per gram of extract).
4. Place this in a reflux apparatus and cook it for about an hour. In case you¡¦re not familiar this is basically just Pyrex breaker with a large looped tube plugged into the top. This will cause the solution inside to be exposed to elevated pressures as well as temperatures, as well as preserving all of the original contents. Simply simply boiling the mixture in a small strong covered vessel can mimic it.
5. Wash what¡¦s left with water, keep the oil layer.
6. Neutralize your mix (bring it to pH 7.0) with a little Sodium Hydroxide solution (pH 9.0) or baking soda then rewash it with water. Save the oil layer again.
7. Allow your oil to evaporate and you should be left with a sticky amber liquid that contains almost pure THC.
from http://www.420magazine.com/forums/c...isomerization-thc-produce-purest-extract.html
Also:
"Grind up your weed really small and get it really dry. Let it soak in an acetone solution and throw in some pure acetic acid. you can get acetic acid (vinegar) more pure by freezing the vinegar slightly and the water will freeze first. Water freezes at 32 deg F and acetic acid freezes at 28 deg F. So use a strainer to filter through and remove alot of the water to get purer acetic acid. Pour the acetic acid water solution into the acetone solution and let it sit for a week or more. Heating the solution causes the whole reaction to happen more quickly. Candle warmers work great for this (accelerating evaporation times requires well ventilated areas). The acetic acid turns the thc and cannabinoids into the thc acetate which is many times more potent than any thc nature can produce. Filter out all the useless gunk with a strainer and coffee filters and Pour the acetone solution into a glass drying tray and let all the acetone evaporate. Then pour in a bunch of Bestine from any art supply store ( chemical name is heptane). This is called a non-polar solvent and it floats on water. You do this to basically separate the thc oils from anything water soluble like the acetic acid. Pour everything into a large large glass jar and Keep pouring distilled water into the jar and siphoning the top layer ( the thc bestine) off or just siphon out the water from the bottom with a glass turkey baster. Keep adding and removing the distilled water until its clear. Lastly pour off the liquid into a large glass baking tray and let the bestine evaporate. This will leave you with a dark honey colored oil. You can simply smoke this oil ( pour it on bowls) or soak it up with J papers ( j-paper balls soaked in pure thc acetate and crumbled up, placed in a bowl), lace blunts with or combine it with any oil ( sesame oil holds the most thc) if you want to make edibles. Combine it with sesame oil and freeze it, then put it into capsules. One capsule and bam,higher than hell for 12 hours, anywhere anytime.
note both heptane and acetone while being toxic have really fast evaporation rates, so it will be really easy to tell when they are released out of the mix. Heating the mixure insures that all heptane or acetone have evaporated. If you have so much thc oil in the end that some heptane gets trapped under mounds of thc oil, then heat the solution or add boiling water to get the remaining bestine (heptane) to evaporate into the air.
Also note* This method will turn bad mid grade or low grade buds into a much better smoke with alot of THC acetate (stronger than THC). Basically mid grade bud is bud that has had its THC degrade into CBD and CBN which are cannabinoids. The acetic acid converts the CBD and CBN back into THC and thus bad bud becomes good bud, but in a pure oil form. These processes are known as the isomerization and acetylation (sp?) of hash oil.
Last NOTE* always let your acetone or bestine evaporate in a well-ventilated room or outside, Sorry if that wasnt clear but I was meaning to address the people that obviously know this already. The candle warmer will cause more fumes to come off faster so make sure you know what you are doing. If you want to avoid heating, then let it evaporate naturally, it will take longer, but it still wont take more than a week. Just get the largest glass baking tray you can get."
got it from
http://www.reddit.com/r/Marijuana/comments/979wf/how_to_extract_and_convert_your_weeds_thc_into/
