Double-check to ensure that your selected dye will work with your couch's upholstery. Leather dye/colorants are formulated to work with both aniline leather and regular leather, so choose a variety that matches the material used to make your couch.
Rub down your couch using the leather cleaner and a clean rag. Wipe away the excess cleaner from the surface with another dry rag if needed.
Pour the color into a spray bottle and apply the color to the leather. Repeat until the desired level of color saturation has been achieved. Spray a very fine mist to prevent the dye from running.
Allow the couch to dry overnight. If you need to speed up the drying process, you can use a hairdryer on the lowest setting.
Rub leather conditioner on to the couch with a soft cloth. This prolongs the life of the leather and prevents it from fading.