In order to understand the concept behind the creation of Walk Over Evil Powder, one first needs to understand the importance of foot-track spells in African-derived folk-magic. In the sub-set of the tradition known as direct foot-track magic, A person bent on doing ill can powerfully affect another by laying a trick that caused them to step upon or walk across something evil, such as Crossing Powder; powdered rattlesnake skins, buried nails, pins, or stones laid in an "X" pattern; Goofer Dust; or Hot Foot Powder. The injuries caused by malevolent foot-track magic range from general runs of bad luck and mental disturbances to unnatural illnesses and deadly medical problems. The victims of such magic are said to be "hurt" or "poisoned through the feet."
If you suspect that someone is trying to mess you up by laying tricks for you to walk over, you can protect yourself sprinkling a pinch of Walk Over Evil Powder in each shoe, or by applying Walk Over Evil Powder to the soles of your feet. In cases where it seems obvious that a "war" is ongoing -- especially if you find yourself stepping over odd messes or cutting your feet on sharp objects that have been put down, it is a good idea to perform a general cleansing of the area, including the burning of candles dressed with FWalk Over Evil Powder. If you have already been crossed, you can also perform an Uncrossing spell to take off the jinx.