I save all my Herborizer XL abv for edibles. It is uniiform medium brown. Not dark, not light, at the temp setting I use.
I dont ever savev my vapcap abv. I can use the vast majority of actives without needing to go to temps that are high enough to bother my very sensitive lungs.
With the Herborizer, to achieve the same darkness, and level of extraction, I would have to really suffer with my chest and throat.
There are plenty of actives still left in the Herborizer abv, it is still quite fresh and pleasant.
The vapcap abv is very dark brown, not so pleasant and has very minimal actives left. I could leave it lighter and save it for cooking, but even then it is still more spent than the Heborizer abv and would not make such pleasant coconut oil. I feel I get better use from it to get an extra hit per vapcap bowl.
So I inspect the abv for several reasons. To see how much actives are left to decide when to stop vaping it or if to crumble down finer,
-to see how even the load is being cooked, and,
- to see if it is worth saving and cooking with.
While the abv colur is not a perfect representation of the exact level of actives remaining, it is without question a very accurate and valid guide of the completeness of extraction.
I also cannot subscribe the the idea that it is mostly due to chlorophyl levels.
I see the undoubted correlation with how done the load is, every time, same variables, different herb.