You can try adding a few drops of vinegar or clove oil to prevent mold growth. Clove oil smells great too. I’ve used thymol, a fungicide, but it’s toxic and I no longer use it. I used to use it in my bookbinding wheat glues. 

You could also wine, and in Cennini’s day, they sometimes used urine. I didn’t make that up. 

I use RO (reverse osmosis filtered) water with my paints. I started using this many years ago when one of my parrots contracted cryptosporidium (from agricultural run-off - RO filtration offered the best results. Filters are expensive but vet bills are more expensive. 

K

Sent from my iPhone

On Feb 4, 2019, at 4:37 PM, Marni Fylling <[log in to unmask]> wrote:

... And there are spores floating around in the air, bacteria on paintbrushes, on your fingertips, everywhere! If there is enough moisture and the temperature is right, you will grow something...

Have a great week, everyone!
- marni
From: SciArt-L Discussion List-for Natural Science Illustration- <[log in to unmask]> on behalf of Lynette Cook <[log in to unmask]>
Sent: Monday, February 4, 2019 5:11:36 PM
To: [log in to unmask]
Subject: Re: [SCIART] Gesso without a screw cap? (Slightly TAN subject)
 
Good point, Bruce. I have been thinking about this all wrong, then, assuming mold spores were being introduced by tap water contamination and not already there in the substrate. 

Lynette

On Feb 4, 2019, at 2:06 PM, Bruce Bartrug <[log in to unmask]> wrote:

Lynette,
In this case, distilled water wouldn't make any difference.  Minerals in water don't jump start mold, and chlorine in the water might even delay the growth for a while.  If the substrate can grow mold, it probably will.  Sometimes with a vengeance :).

bruce

On Mon, Feb 4, 2019 at 4:53 PM Lynette Cook <[log in to unmask]> wrote:
Interesting about the caution regarding water. This is true with distilled water also? I know tap can be an issue. When I find mold on my paint or gesso (and it’s rare) it tends to be a container that I have contaminated by putting my paintbrush inside (i.e. wet brush that had been in the tap rinsing water). I fill all my spray bottles with distilled, so it’s tap only in my brush rinse. I usually remember to put only a clean, dry palette knife or other utensil in the containers.

Lynette

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