Prasadam: Honoring Prasadam

                            Q. I was wondering if you could help me understand something. Could you please explain the exchange of karma/bhakti involved when you take someone's remnants? Could you explain the following scenarios if there is a difference...

                            1) Taking the remnants of a pure devotee - do you get the bhakti of the pure devotee and does the pure devotee get some of your karma?

                            Q. 1. If prasadam is spiritual why does it decay like normal food does in a day or so?