I used 99% isopropyl alcohol along with just over a quarter of some very nice bud. I let it sit in a canning jar for 2 days then strained the liquid through a coffee strainer and left it on the stove, in a glass plate, with the exaust running. It took around 5 hours untill all the liquid was gone and i was able to scrape up the goo. It was nice and black, not green like the liquid was initally and provided a very nice smoke however I only had about 1.5g of hash. It fucked 6 seasoned smokers up so I suppose it was worth it.. its just hard to see a quarter turn into 1.5g when you are used to quantifying everything your stash in terms of how much it can be sold for.