I suspect the white stuff referred to is actually foam caused when the butane was boiling off and it perked through some contaminant in the butane, water, or some by-product leached out of the weed.

I get white stuff occasionally, but I don't know for sure what causes it. I vote for water, since it's almost impossible to remove all moisture from either the plants or the air, and because the white stuff reminds me of the foam we used to find in air cooled engines that got water in the oil, as well as the foam that gathers on the top of melted butter when you separate it.

The author is right that it smokes up all right. I've done it, but I don't generally smoke pure honey oil regardless of the color -- it's just too messy and wasteful. I either mix it with kif and press it into bricks or I melt butter into the jar I captured the stuff in and make a budder that's potent, but doesn't have that "pot brownie" taste when I cook with it.

Oh -- and I did some work with my gunpowder scales -- 30g of A-/B bud gave me 2.46g of honey oil after the solvent was all evaporated, but the extract was still the consistency of chilled honey. I know the resin content of 15g of the donor was low and not worth smoking. That's why I used it. Your results may (will probably) vary.

If we look at the estimated value of a gram of honey from the above post ^ we see that it's not a really cost effective product to make commercially in small volumes. Goes good as a dip for shrimp, though.