entropy99
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It has to do with the butane purging method. through the advice of some of the good folk here on the farm i am improving my methods. the dark oily stuff is purged quickly with a high heat (over160deg) the yellow buttery stuff has been purged with a slower lower heat(140deg or less).
i am going to repost a link here that I got from a fellow thcfarmer that gives the total low down on BHO...
http://skunkpharmresearch.com/bho-extraction/
some of my more difficult questions about the art were answered there.
thanks crom for originally posting this link in the wake and bake thread! Which if you haven't checked that thread out, you should! Lots of of good farmers oils, waxes and nugs too! here is a link....
https://www.thcfarmer.com/community/threads/wakenbake.33511
Interesting. Which is higher purity?