| http://www.w3.org/ns/prov#value | - Again, there is the objection that there is a tendency to an increase in light loss of the glass when the content of (T1 0 R 0) exceeds 30 mol That is to say, glass contains such transition metal ions as Fe, Ni and Co as impurities, and the light absorption by these ions become one of the causes of the light transmission loss of glass.
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