Tracking Ink is a specially formulated ink made specifically for recording animal footprints. The ink will not dry out provided it is applied to a non-porous surface such as the PVC coated Traps.co.nz tracking tunnel cards. The bottle has a sponge applicator to make application on the cards a simple process. Just remove the applicator bottle top and apply a thick coating of ink onto the vinyl square on the in the middle of the cards. Also suitable for applying to Chew Track Cards as an additional ID to bite-marks when monitoring pest species.