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wool is a protein fiber. Proteins have the ability to contract and relax depending on the environment. Like our hair, wool has scales on the outside of each single fiber. Alcalic environment will make the scales stick out. Sour will make them go back in place. If you want your wool to remain shiny and soft, add a splash of vinegar to the washing water. Never use softener (?) or detergents with enzymes.
@sinituulia you can literally boil wool. but the moment you add cold water, the fibers will contract at once. and you will never be able to relax them again. If you wash with an alcalic detergent you just made a piece of felt.
No temperature shocks. Keep it sour. If you do not have wool detergent, just use hair shampoo. It's the same material. Treat it gently when wet. No wringing, no kneading. Dry on a flat surface.
Silk is similar. It is a similar material.