Whitewashing is used for many purposes, from picket fences to building columns. One use that you see less frequently these days is whitewashing widows. This was done (and is still occasionally done, when a store owner was making changes or doing construction in his store, and he did not want those passing by to see the work until it was completed. Whitewashing the windows has the effect of making in very hard for someone one the street to see inside, but it still lets those inside see outside and get light. Making whitewash for your windows is a fairly simple process.
Mix 3kg of calcium hydroxide with 8 litres of water and let it soak for several hours.
Mix 2kg of salt with 10 litres of water. Still until the salt totally dissolve.
Drain the excess water from the first mixture and then mix in enough of the second to get the thickness you want. For use on a window, it should be almost watery thin. You can now apply the whitewash to the window using a brush.