Apple cider vinegar will cause your metal caps to rust.   If using apple cider vinegar in your tincture,  use either a plastic lid or place a piece of plastic wrap between the jar and the metal lid.

Typically, we chop herbs to be put in a tincture; however, black walnuts contain juglone and tannins, which once you remove the hull, will stain everything it comes in contact with.  So, we will be leaving our black walnuts whole for our tincture.