@Don
M Graham paint has honey so that will attract moisture. Mold likes damp and dark places so if mold is present in the environment it can grow on the watercolour.
There are two solutions to prevent mold.
1. Make sure the pen is completely dry before you store them away. This can be difficult due to humidity in the air. E.g. Here in Singapore which is humid, I will not close my watercolour box completely so that there's ventilation and light.
2. Keep the watercolour box covered, but under or near sunlight. This will heat up the box to dry the paint, and also heat will prevent mold growth.
I used to have a lot of problems with mold but ever since I used these two methods, I no longer have mold growth on my paint.
Using rubbing alcohol to kill the mold is only a temporary solution.
@Don
M Graham paint has honey so that will attract moisture. Mold likes damp and dark places so if mold is present in the environment it can grow on the watercolour.
There are two solutions to prevent mold.
1. Make sure the pen is completely dry before you store them away. This can be difficult due to humidity in the air. E.g. Here in Singapore which is humid, I will not close my watercolour box completely so that there's ventilation and light.
2. Keep the watercolour box covered, but under or near sunlight. This will heat up the box to dry the paint, and also heat will prevent mold growth.
I used to have a lot of problems with mold but ever since I used these two methods, I no longer have mold growth on my paint.
Using rubbing alcohol to kill the mold is only a temporary solution.