No it most certainly isnt, to break all the bonds in the glycerol you need to put in an enthalpy of +6974 and the energy released when the bonds reform is -5852, so you get less energy out then you put in so it wont burn.
The Ring Finger - The Meaning of the Ring Finger for Rings: Emotion, Creativity & Heart: Wearing a ring on the ring finger represents a connection to the heart, as it is thought to be closely related to the artery that goes to the heart. It is associated with our feelings of affection and love.
A black ring on the left fingers has no official meaning, to the best of my knowledge. It's just the right fingers that the swinger community has taken :) (Correct me if I'm wrong, I am not aware of any polyamorous conventions, just the swinger community's conventions).