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Preservatives for making watercolor paint?ApproveRejectUn-ApproveSubscribeUn-Unsubscribe

Question asked 2021-11-26 12:50:55 ... Most recent comment 2024-01-23 18:00:58
Watercolor Paint Making Paint Additives

​I have been making my own watercolor paint and have had a problem with mold growing on some colors.  

What are some preservatives that I could add to my paint to prevent mold growth?

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Moderator Answer (brian baade)

[2021-11-29 16:31:49]

​Sorry for the late response. I have been traveling. A drop or two of Thymol dissolved in alcohol added to a volume (5 fluid oz or so) of dissolved gum Arabic was always suggested for this purpose in the past. This may not be the case today.

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User Comment

[2024-01-23 18:00:58]

Tea tree oil, clove oil, and rosemary have also been suggested. One study of their effectiveness in lettuce showed that the first two were effective and rosemary wasn't.​ Watercolors, of course, aren't lettuce. However, based on that study (and the popularity of clove oil in watercolors formulations), I would lean toward clove and tea tree oil and skip the rosemary.


M Graham also stated that honey inhibits biofilm (mold, fungus) growth. For honey, it would be best to be able to be certain that what they're buying is 100% honey. Adulteration of the world's honey supply is a big problem. Honey might also have issues with some uncommon pigments (like copper greens and blues) due to its pH, which I recall is somewhat acidic.


Another possibility is sodium benzoate. It might be better than plant oils because of better solubility with water.

— SRS

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