I am not sure but it might be alkali pH.
Synthetic wool is man-made; wool is cleaned, carded and spun fleece that animals grow on their skin.
Once the wool is sheared from the sheep, it is cleaned, carded and spun into thread.
Lambs wool is cleaned, carded and spun from fleece grown by lambs.
Yak wool is cleaned, carded and spun from yak fleece.
because the yarn in the sweater is cleaned and died and the wool on the sheep is not
Fleece -- from which wool is cleaned, carded and spun -- is renewable. Items fabricated from wool can often be re-purposed.
An alpaca animal grows fleece that can be cleaned, carded and spun into alpaca wool.
It dissolves it.
Cotton wool is cotton that has been cleaned with large foreign material removed. It is a solid.
When wool is dipped in sulphuric acid, it undergoes a process called sulfonation. The acid reacts with the wool fibers, breaking down the protein structure and causing them to dissolve. This process can be used to modify the properties of wool for various industrial applications.
Use a dry cleaner
He/she takes the raw fibers , after they are cleaned, and spins the fibers into yarn.