White and Powdery Full Melt: What's the Tek?

I found the old school grading system for bubble hash the other day (1-6*)

The internet rumors i read about 6* bubble hash/ice water hash claim (considered to be true full melt) it is so pure (nothing but 99.9% trichome heads) when dabbed correctly it completely disappears leaving NO residuals on the banger/nail.

I’m intrigued by the whole poof thing when dabbed like melt and gone. No mess. No ash. No residue?? No nothing?

If it’s true and a product like that can be made out of bubble/ice water wouldn’t it kind of make it the cleanest high and most natural potential concentrate you can get outta the plant?