John
It is how to tan snake skin hides for leather work.
The jar has a mix of glycerin and alcohol (It can be isopropyl or denatured).
They get used in all types of leather work. Wallets, long bow sheathing, hat bands etc.
This is one from in front of my porch a couple years ago. I have kept it, as is, because of the unusual hole in the skin.
There are many stories of folks getting bitten by severed rattlesnake heads. Believe me many are true.
I shot this snakes head off. The body kept coiling and when it came in contact with the severed head, the head bit it’s own body.
I skinned it and placed it in the jar but the venom ate that hole into the hide regardless.
I have a video of the whole event.
The skin is soft and pliable.