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Durable Wood paint

A wood paint that is cheap, durable and easy to make at home with readily available and "non toxic" material

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I tried replicating the paint from sweden that give this beautiful Red color to their house (Falu red on Wikipedia) with material I could source easily.
By following the recipe you will get a nice red paint that is fungicide, should last 10 years and the color is stable to the UV. It works well for wood but I don't think it will work with concrete or plaster.

(When I said Non Toxic, I mean that will not kill you like lead or chrome oxyde. But try not to swallow it please)

On the left picture you can see some brown paint made with a brown iron oxyde and the blue one is a failed attempt of blue paint with copper sulfate as Dye. The red one in the middle is what you get if you follow the recipie with red Iron Oxyde (Fe2O3).

If you manage to make some other color (like green with copper oxyde for example) please tell me i'm very curious to see the possibilities. There is a lot of room left to experiment with. like instead of flour use corn starch or potato starch.
  • 1 × 2.5 Kg of Iron oxyde (III) (Fe2O3) Give it's red color to the paint. you may be able to replace it with another pigment
  • 1 × 650 g of flour It act as a binder
  • 1 × 8 liter of Water Normal tap water
  • 1 × 250 g of Iron (II) sulfate (FeSO4) act as a dye fixative
  • 1 × 50 g of copper sulfate act as fungicide

View all 7 components

  • practical application

    Nathann06/02/2019 at 16:57 0 comments

    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

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  • 1
    Preparation of 10 Liter of red paint

    Gather the material as lister above, get a hot stove, a beaker or a cooking pot and a scale

  • 2
    Binder preparation

    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

  • 3
    adding the Dye

    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

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Tom Nardi wrote 06/03/2019 at 17:35 point

Don't usually see chemistry-related projects here on IO. Glad you've shared it, very interested in seeing how the project progresses.

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