Does Sunlight Fade a Leather Bag?

Yes. The Canadian Conservation Institute says that direct sunlight, daylight and spotlights can all cause discolouration, drying and photochemical degradation of leather, and that the damage from light is cumulative and irreversible. Dyed or painted leather can be much more light-sensitive.

What the CCI says

• Unpainted leather is moderately sensitive to light.
• Painted or dyed leather can be extremely light-sensitive, so it should have a much lower exposure.
• Damage due to light is cumulative and irreversible, so exposure time should be limited.
• Direct sunlight, daylight and spotlights should be avoided.
• Leather should be stored in the dark if possible, and dyed items in closed boxes or containers if the storeroom is lit.

How to protect a bag

1. Keep it out of sunny windows.
2. Do not leave it on a car seat or the rear shelf.
3. Store it in a dust bag or a closed cupboard.
4. Rotate which side faces outwards if it sits on display.
5. If you notice a lighter patch, avoid rubbing in dyes or polish, and ask a specialist.

What the CCI figures mean for you

The CCI gives lux limits for museum displays, which are low compared with a sunny room. You cannot measure them at home, so the practical lesson is simple: the less light, the better.

If a bag has already lightened on one side, the colour usually cannot be restored at home. Conservators treat light damage as permanent, so the useful step is to stop further exposure and, for a bag you value, to ask a specialist whether recolouring is an option.

Where this answer stops

The note is about museum leather, and a bag in daily use will always see some light. The aim is to reduce unnecessary exposure, not to avoid daylight entirely.