| http://www.w3.org/ns/prov#value | - Examples of gelatin hardeners are aldehyde hardeners, such as formaldehyde, glutaraldehyde and the like, active halogen hardeners, such as 2,4-dichloro-6-hydroxy-1,3,5-triazine, 2-chloro-4,6-hydroxy-1,3,5-triazine and the like, active vinyl hardeners, such as bis-vinylsulfonyl-methane, 1,2-vinylsulfonyl-ethane, bis-vinylsulfonyl-methyl ether, 1,2-bis-vinylsulfonylethyl ether and the like, N-methyl
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