The method used is the same as discussed in the thread:
Basically, I soaked some weed
in 99.9% Isopropyl alcohol
for one minute; in a mason jar with just enough iso to cover the weed. The alcohol turned black almost immedeately.
I then poured the liquid through a sieve ( just an ordinary kitchen one) and into a flat-based pyrex dish. This was allowed to evaporate in a room with an open window and no naked flames.
After 24 hours the liquid was placed in an electric oven on 120 centigrade for 1 hour. I removed it while some Iso was left, to avoid burning the oil.
And that's it. A crude method with minimal equipment, that relies on the quality of solvent rather than the ability of the "chemist". Easily done on the sly while no others are about. The strong point of Iso extraction is that the solvent evaporates off, and is less toxic than some other solvents like methanol/methyl alcohol. The downside is that it's also less selective; so say double the yield is obtained at half the strength. This is definately no refined, isomerised high grade stuff; but still plenty strong.
As you are in the US, I would suggest using a high strength pure grain alcohol, the strongest you can get your hands on. This will be more selective in it's action and the oil will taste better.
There is some discussion of the tek for Iso extraction on DF, but the consensus seems to favour quick extraction, to minimise chlorophyl extraction. The period of 1 hour is arbitrary and a compromise between 24 hours and a few minutes.
The taste is quite nice orally, but slightly harsh in an e-cig vape. But plenty of throat hit.
I cannot stress this enough- Isopropyl alcohol is volatile and could easily be explosive if mixed with air and ignited. No naked flames, no pilot lights, no smoking! Make sure the area used is well ventilated. Please don't blow yourself up.
Something I came across yesterday; a friend has given me a booklet "Cannabis
Alchemy: The Art of Modern Hashmaking" by David Hoye. Produced by The Twentieth Century Alchemist in 1973 through to 1975. I googled David Hoye 1973, and came up with some interesting stuff. The Iso oil is good, and easy to make, but it can be done so much better.
I have some more comments on the use of e-cigs and cannabis tincture/infusion, based on recent trail and error:
I'm using a fairly runny tincture, Iso oil diluted about 3:1 with veg glycerine. A more viscous mix seems to kill the atomiser within days.
My e-cig has a 900mAh battery, although 510 batteries seem to do the job also. The atomiser is a low resistance 510.
I have dispensed with the wadding in the atomiser cartridge. It seems to get gunked up in no time, preventing a proper airflow. I prefer to directly drip 1 or 2 drops onto the atomiser bridge.
Daily cleaning of the atomiser with compressed air is essential; through the hole at the bottom, and from above the bridge as well.
It feels weird writing in 1st person, and I'm missing Uncle Baldylocks.
Just a quick addition: it would appear that there are some serious safety issues with the advice given in the book "cannabis alchemy". Best speak to an experienced chemist before trying it out.