| http://www.w3.org/ns/prov#value | - The compositions can further comprise other additives, for example pigments; anti-oxidants, for example BHT (2,6-di-tert-butyl-4-methylphenol) or hydroquinone methyl ether in amounts in the range from about 0.1 to about 0.3% by weight of the polymerizable components; ultraviolet stabilizers to prevent discoloration, for example benzophenones such as 2-hydroxy-4-methoxybenzophenone, benzotriazoles,
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