Actually it's kinda the inverse, quick drying will for the most part prevent the enzymes from converting psilocybin to psilocin so mushrooms remain stable when dried. Here's what Trout has to say:
"Unlike psilocin, which is readily oxidized, psilocybin is stable enough to be detectable for many years in herbariums (Dried psilocybin shrooms appear to remain usable for around 9 years or sometimes longer if kept in proper storage; shrooms which contain psilocin often appear to rapidly degrade in storage)"
There's another paper I read (gotta find the source later) that frozen dried mushrooms showed no degradation but room temperature dried mushrooms do eventually degrade.
As for what's in your tincture, my hypothesis is that either it was not alcohol, or it was not psilocybin.
Here's some data:
PsilocybinSlightly soluble (โdifficultlyโ) in ethanol (Merck index)
Slightly soluble = 0.1g to 1g in 100ml (according to
this random website)
so 1ml ethanol dissolves 1mg - 10mg psilocybin (likely lower end since another paper quotes it as almost insoluble)
1ml = 20 drops
so 1 drop = 50 micrograms to 500 micrograms psilocybin
Sounds unlikely you can get such a potent dose with a couple of drops. Unless maybe there was more water in the alcohol, this could make a difference in solubility since according to Hofmann 1971, psilocybin is readily water soluble. Not sure how water content affects stability and how much is needed to significantly increase solubility in ethanol.
Psilocin on the other hand is more soluble in ethanol so at least solubility-wise it would make sense, but its way more unstable so Im not sure that could be the case.
Psilocin Soluble in ethanol (Clarke's 1986)
Soluble = 3.3g to 10g in 100ml
so 1ml = 30-100mg
1ml = 20 drops
so 1 drop = 1.5 - 5mg
Is it possible it was 4-AcO-DMT? Not sure 4-AcO-DMT's solubility in ethanol, can't find data on it, but it occured to me that was it. If you put a drop on some paper it should stain black after some minutes.
Another possibility is it wasn't ethanol-based tincture but something else.
Do you still have access to those drops?