Preventative measures can help protect against mould in oil paintings which becomes prevalent when relative humidity is raised above 55%; when the temperature is around 20 degrees celsius and in darkness.

In response, to fight off infestation it is recommended for the environment to be controlled, for the relative humidity to be maintained below 55%, for the environment to be kept relatively cool and to expose the mould to sunlight.

For more advice on the best environmental conditions and to avoid mould in oil paintings, you may find it helpful to read How To Store Your Artwork.