To one liter of skim milk, add 250 g (½ lb) of slaked lime**, 800 to 900 g (1¾ to 2 lb) of chalk powder and 1/2 liter (about 2½ cups) of linseed oil.
Mix using a whisk or a hand mixer until you get to the ribbon stage. Dilute 50 g (1¾ oz) of natural pigments in a small amount of water.
Add it to the mix; your paint is ready to use!
Prepare the walls for painting by scraping off loose and flaky paint and washing the walls with washing soda to remove grease and dirt.
Fill in cracks and holes if needed. You may also need to degloss old glossy finishes by sanding.
Then, using a wide, straight-edged (wall) brush, apply three coats of your whitewash paint, waiting at least six hours between two coats.
The quantities in this recipe are sufficient to cover an average-sized wall (10 sq. m / 100 sq. feet).
If you need to use your paint over several days, be sure to cover it tightly and then thin it with a little milk if necessary.
Your whitewashed wall will need a fresh coat of paint only about every ten years.

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