Like Bogmaster says, SFE was the rave back 25 years ago. I experimented with SFE based formulas and modified some existing formulas by adding varying amounts to and sent the SFE formulas to some of America's best trappers of the time for testing and opinions. None were impressed and all preferred my lure formulas just the way they were already. SFE definitely would make a great skunk lure as the number of skunks caught at the SFE test sets was more than double the usual number. Ace