J.Kieffer genuine leather accessories are each handmade, varying beautifully in color and characteristic. Your unique bag may begin to darken over time, due to oils in the leather and environmental factors. Don’t worry – it’s natural. Avoid prolonged exposure to intense sunlight, heat, and humidity. Contact with water, oil, and makeup can also stain leather. If you do spill something on your bag, you can clean it by simply wiping it with a clean light colored warm cloth or take it to a professional.