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You can purchase these oils online or at a shoe repair store. These products are manufactured specifically to condition leather and darken it. Other oils, like olive oil, can stain the surface of your leather, so avoid using them. Measure a tablespoon of the oil and saturate a small area on your cloth. You only need a little bit so do not saturate the entire cloth. Go in a back and forth motion over the surface your leather. Try to apply the oil in one uniform layer. The leather should start to darken. If you run out of oil on your cloth, put another tablespoon of oil on it. Once you're done applying the first layer of oil, let the leather dry out overnight. Come back to the leather and see if it's as dark as you wanted it. If the leather isn't as dark as you wanted, saturate your cloth with the oil and repeat the process, letting the leather dry in between coats. You can apply as many coats of oil that you want until it reaches the hue that you desire. Remember to let the leather dry in between coats.
Purchase neatsfoot oil compound, mink oil, or leather honey. Pour a tablespoon of the oil onto a non-abrasive cloth. Rub the oil onto the surface in an even layer. Let the oil dry overnight. Apply more coats of oil to make your leather even darker.