Which metal oxide is used to make blue glass

1.	Which metal oxide is used to make blue glass
A.	\[F{{e}_{2}}{{O}_{3}}\]
B.	\[CoO\]
C.	\[C{{u}_{2}}O\]
D.	\[NiO\]
Answer» C. \[C{{u}_{2}}O\]

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Which metal oxide is used to make blue glass

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