Leather can darken for several reasons, including:
- Exposure to sunlight: Sunlight's ultraviolet (UV) rays can cause leather to fade and become darker over time.
- Moisture: Leather can absorb moisture, leading to darkening. This is especially true for leather that is not properly treated or stored.
- Use of oils or leather conditioner: While leather conditioners are designed to protect leather, using too much or too frequently can clog the pores of the leather, causing darkening.
- Contact with certain chemicals: Some chemicals, such as iron or vinegar, can react with the tannins in leather, causing it to turn black.
- Aging: Leather naturally darkens with age, as the oils and pigments in the leather break down.
It's important to note that the darkening of leather is not always a bad thing. In some cases, it can actually enhance the appearance of the leather, giving it a more aged or vintage look.