tincture and THCA (tetrahydrocannabolic acid)

i found a recipe for making tincture that mentions a chemical called tetrahydrocannabolic acid, THCA, that is used to express thc content in whole plant cannabis. it says that in order to turn thca into thc, the cannabis needs to be heated such as in cooking or smoking. so theyre recipe calls for converted buds to make the tincture.
this is done by heating your oven to exactly 325 f and cook the buds/trim on a 1 inch layer spread on a cookie sheet for 5 minutes. never heard of this but i did it anyway and it caused my whole kitchen and living room to smell like dank weed. i pulverized the dry pot and put it in a mason jar and filled it with 20 oz.s of bombay saphire gin.
has anyone else made tincture this way? this is my first grow so im learning as i go. ive never heard of cooking your buds first before putting them in jars. anybody tried this?

i think 325 is far too hot. you will have vaporized the THC off the plant at that heat. i wouldn't be surprized if your tincture had little potency. sorry. i hope i'm wrong.

well, my tincture came out pretty nice. on the bottom of the mason jar is a layer of hash so i gotta shake it good before use.
if you google vancouver island compassion society you'll find this recipe. Thca is not delta-9 tetrahydrocannabinol, hence the delta part.

actually thca is delta-9 tetrahydrocannabolic acid. its thc with an extra carboxillic acid group (COOH). This compound is what the plant produces (mostly although regular thc is also produced) this is why you cure weed before you smoke it. this gives the thca a chance to decarboxlyize (drop COOH group). However, this process rapidly occurs at 106 C (if my memory serves me) thats why cannabutter works so well (often water is used to help regulate the temp). Obviously smoking does this (probably not as efficiently as cannabutter). The delta-9 actually has to do with a convenient way of naming the molecule (not as applicable as the terpentine numbering system that calls it delta-1 thc-i think) that involves the location of a double bond.
...or so ive heard...