| http://www.w3.org/ns/prov#value | - On one surface 13 of substrate 11 is deposited optical film 14 of suitable optical material such as a dielectric including silicon dioxide, titanium dioxide, silicon, zinc selenide, or an organic material including polyester, polymethylmethacrylate, siloxane or a suitable polymeric or biopolymer, film 14 thickness being dependent on the desired reflective characteristics of applied film 14 conside
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