Hey SkyHigh so this is what Capital told me after i told them there is still oil in there tane
There is no oil. What you are finding is a white substances that evaporates when you touch it or add the smallest amount of heat to it. Butanes evaporation point is 31 degrees. People run these tests with butane that is 0-10 degrees F. When you blast a can through a glass extractor the extractor gets cold and frosts. All thats in the can is carbon and hydrogen so look a little closer at the variables in your experiments and the substance you are finding. cheers
After the boil off the outside of the flattened bag is sandwiched between two washcloths to catch any gross moisture, and then the bag is vacuumed down twice to -29.9" Hg before being weighed. There is nothing left but an oily substance, in the case of Capital N-butane, a gummy one at that.
I answered this exact same allegation by them yesterday in public at another forum. The test is tight and true, how it's done,
Cheapest generic supermarket one gallon ziplock bag, cut the ziplock off, fold up, place on .01 or .001 scale, record tare weight, fold over the top one inch to the outside, place in a pyrex dish, place the pyrex dish in another dish, squirt a full can of ~300ml butane lighter refill into a quart Mason jar as per the video, pour the liquid butane into the plastic bag, add warm water to the larger dish, after boil off vacuum purge the bag, fold the bag, place on scale, record weight, deduct tare weight from final weight.
Freeze the can of butane and the Mason jar by placing in the freezer for a couple of hours before the test to maximize the amount of liquid butane collected.
Mason jar extraction video,
http://www.youtube.com/watch?v=VTVRYk0Zdg4&feature=youtu.be