To make a high CBD tincture
Purchase 1/2 ounce of high potency (>20% CBD, < 0.5 % THC) marijuana such as Harlequin or Canna-Tsu. Purchase 95 % alcohol (everclear.) For smaller doses use the rule of 1 gram to one ounce/30 ml of booze.
The first step is to decarboxylate the marijuana by placing it in the over at a very low temperature (245 degrees) for 90 minutes. If you are trying to extract THC then you need less time (45 minutes). Decarboxylation is the process of making the active constituents more readily available via removing the carboxyl acid.
Spread your pot out on a baking sheet and then decarboxylate the plant in the oven. Then place the cannabis in a liter jar (500 ml). Then add the ever clear to fill the bottled cap it shut. Place it in a cool, dark area and shake the bottle daily for 4 weeks. After that, strain out the alcohol. Voila you have a high CBD cannabis tincture.