Ive never dont it but you can use mineral oil to extract the THC for tincture if you are using buds or trimmings. Just emerse whatever you want to exctract the THC from and let it sit in the mineral oils for abour 2-3 weeks and then strain the plant material out. Whats left is some tasty alcohol free tincture
I believe what you are describing is a hash extraction, not a tincture, but then again idk wtf mineral oil is, could be some tincture tek I've never heard of.
OP, I have the same problems working with oils and glycerin. I believe it is the plant waxes present in the oils (stripped by the solvent during extraction) that make it so hard for the hash oil to form a homogeneous mixture with the glycerin, which is a pretty weak solvent compared to everything else we use.
I would suggest:
dissolving the hash oil into a tiny bit of alcohol first (not an option if you want to be alcohol free), and then adding it to the glycerin.
or, switch to dry sift or bubblehash for your tincture, whose intact trichomes make for a less sticky product that is easier to break apart in the glycerin. I predict that these types of hash will have less plant waxes to cause you problems too, because a solvent is not used.
fuuuuck, made same mistake as psychadelicsam, old thread. whatever its a great question