I thougt if i took 1 gram of dried weed
And poured 99% isopropyl alcohol over like QWISO (Quick wash isopropyl)

Then evaporated the alcohol and weighed the remaining oils to figure out what the thc percentage is in that strain

So for example you wash 1g and get 0,2gs of oil in return
does that mean that my weed contains 1/5 thc? Or better said 20%