Put on a pair of gloves to protect your hands from the leather colorant, which can leave hard-to-remove stains.
Shake the bottle of colorant vigorously for at least two minutes. Shaking the bottle ensures that the formula is uniform and won't leave streaks when applied to the leather.
Apply a dab of colorant to a hidden spot of the couch to do a spot test. This ensures that the colorant matches the leather upholstery perfectly.
Apply a layer of colorant to the discolored scratch with a sponge. Allow the area to dry for 10 minutes before wiping away any excess colorant.
Apply another layer of colorant to the scratch. Allow the area to dry for at least 10 minutes before sitting on your couch.