Should You Put Conditioner on a Leather Bag?

Not by default. Conservators advise against chemical dressings on historic leather, and for a bag you use daily you should test first, use very little and follow the maker’s advice. A conditioner can darken, soften or leave a sticky film, and the effect cannot be reversed.

What the sources say

• The Canadian Conservation Institute says to avoid soap, water and chemical dressings on leather objects in collections, and to rely on stable humidity, temperature and light conditions.
• It gives 45 to 55 per cent relative humidity as the target range for leather, and warns that low humidity makes leather dry and brittle.
• The National Park Service’s curatorial guidance for leather and skin products also stresses storage conditions and careful, minimal handling.

If you decide to use a product

1. Check what finish the bag has. Do not use conditioner on suede, nubuck, patent or coated leather unless the maker says it is safe.
2. Test a small amount on a hidden area, and wait a day to see how it dries.
3. Use a clean, soft cloth and a very thin layer.
4. Let it absorb, then buff gently.
5. Stop if the colour darkens or a sticky film appears.

What helps more

Storing the bag away from heat and sun, at a steady humidity, and brushing off dust, are the steps that conservators stress.

Where this answer stops

The sources are for museum collections. Everyday bags are often coated, dyed or treated, so a product that suits one bag may not suit another. Ask the maker, or a specialist, if the bag is valuable.