| http://www.w3.org/ns/prov#value | - Especially when sheet glass is coated with at least one metal oxide such as cobalt oxide, chromium oxide, iron oxide or tin oxide, the optical properties of the glass surface can be improved by dint of the refractive index and absorption coefficient of the metal oxide, and the surface reflectance of the sheet glass can be increased by 3 to 6 times.
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