It's very hard to pour off the yellow fat without re-mixing the two layers, but I found a trick: Melt the butter, but then pour it into a Ziplock bag with one corner pointing downward. Let it sit for 5-10 minutes; don't touch it. The white milk will settle in the bottom corner of the bag, with the yellow fat on top. Snip off a tiny corner of the bag, let the milk stuff run out, and then quickly move the bag over another container when the yellow fat starts spurting out. You can do this even with cheap butter.
Originally Posted by Jamie Madrox
5'0" female, 45 years old. Started Primal October 31, 2011, at a skinny fat 111.5 lbs. Low weight: 99.5 lb on a fast. Gained back to 115(!) on SAD chocolate, potato chips, and stress. Currently 111.