Flour paint is also known as 'Swedish' paint because it has been used for centuries in Scandinavia.
It is comprised of pigment, flour, water , some iron (II) sulfate and linseed oil.
Irt can be applied at temperatures as low as 5 deg.C.
It can face rugged northern winters for as many as ten years.
The image on the left shows a batch I made using iron (III) oxide.
The right image shows 'milk 'paint made from dehydrated powdered milk, guar gum, dispersant and water. Some clay can be added as filler, as needed.