Slime is made by mixing Poly Vinyl Alcohol (PVA) with Borax, which is Sodium tetraborate decahydrate Na2B4O7.(10H2O). In water, the Borax forms Borate ions, B(OH)4. The OH groups of the Borate ion (green in the diagram below), readily form weak hydrogen bonds with the alcohol (OH) group of the PVA. These hydrogen bonds can easily be broken and re-made, giving slime its unique characteristics.
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