How to Deal with Mould on Antique Furniture Safely

Mould on antique furniture is both a condition problem and a potential health concern. The priority is to stop moisture, isolate the object and avoid spreading spores or damaging the surface.

Confirm the warning signs

Mould can appear as grey, white, green or black spotting or soft growth and may have a musty odour. Dust, wax bloom, salts and degraded finishes can look similar. Do not sniff the surface closely or rub it to test.

Protect people first

People with respiratory conditions, allergies or weakened immune systems should not handle mouldy objects. Significant growth, contaminated flood water or mould affecting a room requires appropriate building and health professionals.

Isolate the furniture

Keep the item away from other antiques if it can be moved safely. Avoid carrying it through occupied areas uncovered. Do not seal wet furniture in plastic, which can trap moisture and encourage growth.

Photograph the condition and retain any detached fragments.

Find the moisture source

Check for leaks, condensation, damp walls, high humidity and poor airflow. Correct the source before treating the furniture. The [Canadian Conservation Institute](https://www.canada.ca/en/conservation-institute/services/care-objects/furniture-wooden-objects-basketry/basic-care-furniture-objects-wood.html) notes that high humidity promotes mould and that cellars, garages and attics often have unsuitable fluctuations.

Dry gradually

Move the furniture to a clean, drier, ventilated area. Avoid direct heat and intense airflow across fragile paint, gilding or veneer. Monitor relative humidity and inspect nearby objects.

Do not use household sprays

Bleach, vinegar, disinfectant, scented cleaners and aerosol fungicides can stain wood, corrode fittings, damage finishes and create residues. Vacuuming or brushing spores can disperse them and should be planned with suitable filtration, containment and personal protection.

Obtain specialist help

Use a furniture conservator when growth is extensive, the surface is flaking, upholstery or leather is affected, or the piece has significant value. Building remediation may also be necessary; treating the object without correcting damp will not solve the problem.

After treatment, document the incident and continue environmental monitoring. Recurrence is evidence that moisture remains uncontrolled.

For practical restoration work and workshop demonstrations, [watch and subscribe to Antique Repair Shop on YouTube](https://www.youtube.com/@AntiqueRepairShop).

Sources and further reading

• [Canadian Conservation Institute: Basic care of furniture](https://www.canada.ca/en/conservation-institute/services/care-objects/furniture-wooden-objects-basketry/basic-care-furniture-objects-wood.html)
• [Canadian Conservation Institute: Water as an agent of deterioration](https://www.canada.ca/en/conservation-institute/services/agents-deterioration/water.html)
• [Canadian Conservation Institute: Care of tanned leather](https://www.canada.ca/en/conservation-institute/services/conservation-preservation-publications/canadian-conservation-institute-notes/care-alum-vegetable-mineral-leather.html)