Burning question.

I have a question.  You know the ring around the top of a milk cap?  The one that you twist off to get the gallon of milk open?  Like this:Well, what do you do with that ring?  For 29 years (well, probably less because I don’t know when you start opening gallons of milk) I have done the same thing with the milk ring every time I open it.  However, my husband has a differing opinion on what happens with the ring after the milk is open.  This has become increasingly annoying, to the point of maybe we’re not even going to be allowed to have milk in the house anymore.  I need to settle this once and for all, so your cooperation in this study is greatly appreciated.