FLskwat said:
nop: pot is green so you should stop at dark brown at the most..
Hash is brown so it can go black... you're not at the same proximity to combustion as black weed is (is that clear, LOL?)
I really think the important factor is dryness: no more sticky feeling/moist
ILS and you're done! So if you wish, I suppose you could stop when it's not totally "dry" (though I don't see the point as you will not make edibles out of that mess, will you?).
Fresh herb is green but aged herb is brown. The best herb I ever had was brown and looked like soil but it topped ALL the greenest herb I've tried. I'm still looking for herb like that and that was 16 years ago.
The heat breaks down the chlorophyll and that is why the other colors come through.
The best way to tell combustion is by using temperature because if you start low and then raise the temperature around 445-451f you know you're in the the combustion range.
Dealing with hash is another story because it doesn't have cellulose in it so the combustion temperature isn't 451f BUT it does have a lot of volatile oils so it will burn at a lower temperature unless you vape these first. When you vape these volatile oils first at low temperatures you can then take the hash,unless it is lower quality, to higher temperatures than 451f without combustion to release more cannabinoids. An example is beta-caryophyllene which is high in cannabis and it has a boiling point of approximately 503f.
Keep the temperature low first then raise it higher to get most of the oils from hash without burning anything.