Recipe for Waterproofing Windmill Sails
from wikipedia/Armenian_bole
10 liters water
0.75 l linseed oil
0.75 l grease
1 kg Armenian Bole ~ an earthy red clay which contains iron oxides and silicates...
The iron in the clay helps resist decay by preventing the growth of mold. See also falun ocre, swedish red pigment used for paint: prevents wood rot
"l'ocre rend les bois imputrescibles." -In French this says, the pigment makes it so wood cannot rot.
from www.terresetcouleurs.com/swede.html
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