Most of the bead products absorb ammonia -- which is prevalant in new cigars. The floral foam does not absorb ammonia. I think it's best to remove the ammonia myself as it "taints" the flavor of the cigar.
Some bead products (not HCM Beads) will absorb hydrocarbons that are given off by the cigars and this is why the beads become discolored over time. This also may be a component of what you are detecting.
Just my
