i came here because I was wondering about the possibility of getting a truely high value concentrate. Not for me, it seems foolish, sort of like taking a fine bordeaux, making a decent brandy from it, and then distilling or filtering all of the "impurities" from the Brandy - so you have yourself some ethanol that started out as a treat and now can only be used as paint thinner - or it could be mixed with water so you could drink it comfortably. But there are always people who are interested in this sort of stuff.
All I see are arguments over the relative toxicity of acetone. Acetone in high concentrations isn't very good for you, it can be absorbed through the skin and the body does indeed have a method of expelling acetone, in fact small amounts of it are manufactured in the body as a result of certain imbalances - sometimes caused by a lack of food - or ketogenisis.
But the point is neither here nor there - anyone who works with organic solvents should take care of their lungs, eyes, skin and in most instances - no open flame.
I didn't get what I wanted though - I suspect that this method will bring waxes and various other impurities the amount of which would probably keep this method from being much more than a standard hash oil extraction.
Or am I wrong?