With todays's high trap prices, you can't afford not to preserve your traps. Rust makes a trap sluggish, weak and shortens it's life. A well treated trap sets easier, has more power and speed. Black Logwood Trap Dye is a must for coyote, fox and wolf trappers. A natural form wood dye that chemically reacts with the steel to darken the trap. Easy to use. Crystals - 14oz treats 3-6 doz. traps. Liquid - 4 oz. treats 1-3 doz. traps.