Fill the mason jar with glycerin add your decarboxylated cannabis and shake vigorously.
Wrap your mason jar in the dish towel and put the mason jar with decarboxylated cannabis and glycerin in your slow cooker. Make sure your jar sits on the towel securely and that the lid to the jar is also secured tightly.
Add water to the slow cooker until it is about two-thirds the height of the jar. You don’t want to submerge it, just make sure all of the stuff in the jar is surrounded by water.
Turn the cooker on low and let the mixture sit for 24 hours.
Shake the jar occasionally, when it’s done, you’ll have a jar full of thick, brown-ish tincture. Strain through the cheesecloth and return into the mason jar or a dropper bottle for easier use.