A wood paint that is cheap, durable and easy to make at home with readily available and "non toxic" material
After more than a year bathed in U.V. rain, snow and wind, the color didn't changed which is great.
So it seems to be a great paint for outdoor stuff as it age quite well.
I painted a few sample to see how they behave in the sun and the rain over a week, I will try in the following weeks to make more of it and paint the wood wall of my garden. In the meantime I will try to get some blue with prusse blue insteand of copper sulfate
Gather the material as lister above, get a hot stove, a beaker or a cooking pot and a scale
put 7 liter of water to 100°C (until it start boilling) and while doing so add all the flour to another recipient where you will mix it with the liter of water left until you have an homogenous and sticky mixture. Once it's done you can add the flour mix to the boilling water and keep stirring that it do not precipitate for 15 minutes. Once done you can jump to the next step
now you will add the Dye (Iron Oxyde), the Iron sulfate and the copper sulfate to the mix while you keep stirring for 15 more minutes