| http://www.w3.org/ns/prov#value | - Such a humectant may further comprise an additive such as a hygroscopic amino acid or a salt of such an amino acid, in particular proline, lysine, glycerine, glutamic acid, tyrosine, phenylalanine or leucine, or an inorganic salt, for example, KOH, CaO, MgO, BaCl2.2H2 O, CaC12. 6H2 O, Ca(NO3)2.4H2 O, CaSO4.5H2 O, CrO3, H3 PO4.1/2H2 O, KHSO4, KI, KNO2, K2 CrO4, K2 HPO4, Mg(NO3)2.6H2 O, NH4 Cl, NH4
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