I did an interesting ice water (bubble) hash experiment last week. I started out with 10 ounces of really high quality Barney's Farm LSD and TGA Third Dimension trim. By "high quality," I mean I kept the top cola and whatever was one node below it, and used the rest for hash. Probably 2 ounces were dried, the rest was fresh trim.
I made six twelve-minute runs in the washing machine, no bag in the machine (Thanks Frenchy!), and separated them in pairs: run 1 & 2 (A Grade), run 3 & 4 (B Grade), run 5 & 6 (C Grade). I used three bags -- a 160 as a trash catcher, and a 45 and 25. The 45 I kept, the 25 I used to make butter with. After a day in a cold fridge, I used a microplane to break up the masses (thanks Matt Rize!), and dried it for another day. I then decarbed in a double-boiler for 30 minutes. It's amazing the different textures that resulted, as you'll see below. The A grade is dense, black and sticky. The B grade is much greener, but could probably be pressed into a ball of hash if I worked on it. The C grade is like powder, and wouldn't press no matter what you did to it.
Grade A yielded 5.5 grams, grade B, 4 grams, grade C, 3.5 grams.
I cured in jars for a few days, then sent each sample off to the lab for analysis. The A grade was 48%, B grade 22%, C grade 14%.
Based on this, I'm going to do 2 runs and call it a day. It will seriously lower the yield, but since it's all headstash for me, that's fine.