How can one tell whether their flower is properly cured and flushed?
I'm no expert so take everything I say with a grain of salt. It's based mostly on years of experience with a healthy helping of hearsay.
I read recently on FC that a good test to see if your material is properly flushed is to exhale the vapor through your nose, if it is flushed properly it shouldn't burn. I wish I could remember who said it so I could credit them.
I've been testing this since and I have no way of knowing for sure but it seems accurate. I have had a variety of strains from three different growers. The one grower's strains are flushed properly but too fresh and moist. The other two growers strains are dried properly (62% humidity), and cured more than expected, but not flushed properly. One grower's bud burned quite a bit, the other's was more mild.
As far as curing I've found the best test for me is flavor. Bud that is not cured enough will taste very grassy due to extra chlorophyll. As the chlorophyll dies off the taste of the actual strain starts to come through. The grassy flavor of uncured bud is fresh and vegetal, if it smells like hay it is too dry and has lost goodies.
I've got three strains at once before that all tasted the same. After a month or so of curing they all tasted completely different, one tasted exactly like grapes.
If done properly you can cure for very long amounts of time. I believe DJ Short cures some flowers for years.
I've been curing through instinct developed through experience. Recently I decided to be more scientific and got a hygrometer, I keep it in the bottom of a mason jar face down, so I can read it while the jar is sealed. This lets me monitor my material and make sure it stays at 62% humidity.
Generally I only cure one or two of my top shelf strains, and vape the rest as is. I need a steady supply of cannabis for medical reasons so I can't cure everything to the degree I would like.
Boveda packs work too but I'm too stubborn to pay for those. I figure I've been doing it manually for this long, why change now. Also, the packs are not 100% foolproof so you should be monitoring your stash anyway.
That's the first I've heard of the ash test for flushing, in my combustion days I always thought the white ash meant it was cured well. Although now that you mention it
@herbivore21 some of the stuff I used to cure would lighten after curing, but only to a pale gray. These strains were probably not flushed correctly.