In the cannabis community "tincture" specifically refers to the use of the sugar alcohol glycerin for its ability to absorb under your tongue
Green dragon is a cannabis tincture of ethanol and absorbs largely orally, stomach/intestines
Glycerin is used because its more polar nature allows it to readily absorb sublingually through your mucous membranes... but this polarity also hinders solubility of the psychoactive components..glycerin will hold roughly 30% of its weight in hash..glycerine also has low dissolution rates making a longer soak necessary and fairly inefficient if your using it to extract. You should make hash out of your preferred method then dissolve the hash in hot glycerine ..
it will need to be decarbed ..at least 4 months without heat in a stored container .. the carboxyl group is -cooh which breaks into co2 and h2o.. and if you add moisture back it won't reform the chain...sooo it will decarb in a sealed environment like curing your weed. Because its sealed your bud doesn't loose precious components and remains hydrated and tasty just like good cured bud should....if you decarb in the oven not only is it much more inefficient, destroying your cannabinoids but also flavorful terpenes through pyrolisis, the terps left now aren't even the same, some are very sensitive and easily denatured... Now you could reflux(enclosed boil) to quickly decarb without loosing as much, given its cool before opening..ovens decarb will boil off most flavorful compounds.. without water, in the oven there's nothing holding them back,the terps are sort of trapped in the trichome behind a waxy layer and sort of clinging to internal moisture as well. With their similar boiling point they all boil away together in the oven
But decarbing hash oil over a double boil will allow you to watch the decarboxylation progress via co2 bubbles so you don't over or under do it..
Also the higher the temp you use the less efficient. This goes for every process when decarbed at 500(your lighter) 50%or so makes it as intact thc when decarbed at 210 70% makes it as thc..when decarbed at 170 something like 81%when decarbed without heat its in the 90's.....and because thca is a larger molecule, with its cooh carboxyl chain, decarbing will never be 100% efficient. Thc is just smaller...but low 90's is possible without heat..
Light and heat are the enemy of your terps
Now whether you mean ethanol oral tincture or a glycerin sublingual tincture the method is basically the same..your going to want all the hash dissolved in so heat it and slowly add till its saturated. Any hash floating around will largely not be absorbed or at least efficiently
Because thcs solubility or rather hash oils solubility is fairly constant you can use this to dose accurately. 27.4 mg thc/ml will remain dissolved in ethanol. Keep in mind this is thc nothash oil