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French way to wash white linen

Take 2 vessels with a capacity of at least 7.5 liters, fill and heat 5 l of water in each of them to a boil. In a boiling water of one vessel, dip 10 g of finely ground laundry soap, and dissolve 3-5 crystals of potassium permanganate in another vessel: the color of the solution should be red, not purple. Mix both solutions: in this case, the liquid will take on a dark brown color of the colloidal solution of manganese dioxide. Stir the hot mixture with a stick, causing strong foaming, and dip 2-3 pieces of laundry into it. All stains and all types of contaminants are removed from the tissues if they are kept for 6-8 hours (leave overnight) in such a solution. The next day, wet laundry is removed from the vessel, rinsed, dried and ironed. The use of bluing is not required.
The described method of washing relieves of heavy physical labor, which inevitably involves washing the laundry in the usual way. The laundry does not deteriorate.