Red powder that turns black when mixed with water. Removes light rust and turns traps a dark black color. Works as well as black dye and is considerably cheaper.
Instructions: In a container large enough to cover the amount of traps you want to treat per time, add 1 pound of dye to each 5 gallons of boiling water and simmer for 1 hour. Add water as needed, to keep traps completely covered. Remove traps, rinse with water, and hang to dry. Can be used on all steel traps.
Figure on a pound doing 25 to 30 traps.