Seems like this derailed a bit. For the sake of productivity I'd like to constrain the discussion with a few details.
If you make a claim, you'll have the additional job of coming up with a reasonable explanation to why it is so, and most importantly a possible counter-explanation. So if you say ABV color is a good indicator of extraction, you have to say why and why it may not be a good indicator of such.
As such I'd like to present some very heavy counter-arguments:
- What grants color to ABV are not the cannabinoids.
- Chlorophyll starts degrading at much lower temperatures than what is needed for vaporization, meaning that if these temperatures are sustained, it will degrade, while the cannabinoids will not be affected. "Chlorophyll b was more stable than chlorophyll a at 70 °C, but both of them were highly degraded at 117 °C." -
https://pubmed.ncbi.nlm.nih.gov/24912693/
- Due to the previous point, heating time is relevant to the state of clorophyil degration, which may explain the convection related anecdotal evidence for frequently found lighter ABV(less time at higher temperature) particularly when taking into account that the degration process of clorophyll will always take longer than the change of state for a molecule that's avialable on the outer side of the green matter as opposed to a structure inside heavily protected water filled cells.
- Due to the above mentioned location of chlorophyll inside chloroplasts inside cells, moisture content will also affect this far more than it will for cannabinoids.
As such I don't see how this can be a good measure of extraction.
Assuming most medical use aerosol devices only deliver 10-20% of their dosage to the lungs(reference in my previous post), and given the noticeable difference between direct injection and aerosol absorpion(later 2x faster), and particular location of lypid molecule absorption in the lungs(both facts in previous post) I think it's safe to say that first not all the cannabinoids reach your lungs, second not all the cannabinoids reach the area where they're mostly absorbed in your lungs and third being optimistic and assuming comparable THC absorption to salycilic acid, if holding the vapour in for 30 seconds you'd only absorb half of the content). This means that you'll get around 5% of what you vapourize into your bloodstream.
Considering these 5% to be somewhat stable, particularly across strains, dosages and consumption methods(meaning there's little variation to a dosage you consume and how much gets inside you), a necessary assumption to even continue this discussion.
Considering a complete session meaning that the herb is always sustained for long enough times to complete vaporize everything in them.
Considering that the longer the vapor path the less cannabinoids will arrive to your lungs(reducing the above mentioned 5%).
Back to the beginning and considering the facts we've learned, and going back to the original question, I think it's safe to say that none of that matters to the original question but we can infer that some other facts do:
- The variability of speed of absorption with availability of a given compound in the lungs for the absorption of lypophillic molecules like THC increases with the difference in concentration since lypophillic molecules can cross the membrane by simple diffusion.
- Bigger clouds mean more availability of THC in the lungs resulting in more THC will flow into the cells in the same amount of time than with less THC. As time passes the concentration difference will diminish and so will the speed which means:
- The 30 second reference for half absorption of THC still makes sense regardless of the concentration.
So to confirm the anecdotal evicence we could say that:
- Bigger clouds mean more THC is absorbed in a smaller amount of time giving the sensation of getting higher faster.
- Smaller clouds that end up in the lungs for the same amount of time will result in less absorption due to smaller concentration differences, thus slower speed of diffusion.
- If you held the vapour for enough time to compensation for the difference in the concentration gradient, this would no longer be noticeable.
Very rough overview still hopefully we can consolidate this as this goes on.