So this is my guide and attempt to clear up a lot of the confusing circling around about how to make oil with isopropyl/isopropanol. Hopefully this thread will explain in detail on a proper method to process with these solvents and answer any questions that may remain.Step 1; Material and Material Preperation.The quality of your material is of the UTMOST importance. If you start with something thats not very good, your going to end up with something thats not very good. Personally i like to use sugar leaf/bud/bottom of the bag stuff.The quality of your material will determine how much you should grind your material up. For this demonstration we will be using medium quality bud.Here you can see the bud i started with, 1oz dried.The bud is frozen for approximately 1-2 weeks before hand, this does 2 things, accelerates the breakdown of chlorophyll, and locks what chlorophyll that remains in the plant matter in place. Since the material is of medium quality it is ground up as such, not extremely fine, but a mix of what would be good for a joint, and chunks that are just a little to large to roll...Step 2; Iso quality's and prep.do not, and i cannot stress this enough DO NOT use iso that is below 90% concentration, it is a waste of time and will leave you with a slimey disgusting mess. this is NOT what you want!Quantity of iso to use is under great debate, for med-> high quality materials i like to keep the ratio around 1L of iso to 1oz of bud/sugar leaf, this assures the highest possible cannabinoid recovery.So now you have acquired your isopropyl/isopropanol of greater than 90% concentration, personally i recommend nothing but 99% but that is not available in all areas. If you have to use anything But 99%, there will be some changes in the cooking process.DO NOT SKIP THIS STEP.Freeze your iso!! deep freezer is best but a kitchen freezer works just fine as well, make sure its as cold as the freezer can get it... will usually take between 3-5 days to accomplish this.^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^Step 3; Processing materials and filters.This step is open to a little bit of interpretation, but the filtering process is essential, the containers are not... but i recommend them as they are extremely cheap, durable. and effective!I use 2L pop bottles, cut like so to create a large cup and funnel. You will also notice in the attached picture, reuseable coffee filters, these are the basic plastic ones with the mesh insert mid filter -> filterd -> Step 6; Cooking!Use a pyrex/borosilicate dish.i like to use a hot plate to heat my iso...Cooking is an Art form.. im sorry to say but up until this point there is science in how i make my oil. at this point... its quite simply experience... over cooking your oil will destroy the consistency and very much change the high. Properly cooked iso based oil, should be gel like... eg when i grab a dab of oil, it will pull a tail, then pull the tail back up under its own viscosity.May this guide be of use to you all and serve you all well... for those of you who would like to dispute my methods well...argue with that.This Document is Fiction; any attempts to reproduce it may be illegal. I shall not be held liable for how you apply this information.