| http://www.w3.org/ns/prov#value | - Compounds that protect against sun damage include such things as titanium dioxide, para amino benzoic acid, and benzyl cinnamate.So, photonic crystals are now typically made of insulating or semiconducting materials, such as titanium oxide, silicon dioxide, silicon, or gallium arsenide.Sunblocks containing powdered titanium dioxide or zinc oxide dispersed in a base of petroleum jelly became availa
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