1. Cobalt oxide
  2. Copper oxide
  3. Iron oxide
  4. Nickel oxide
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1 Answers

Option 1 : Cobalt oxide

Cobalt is the most powerful blue colorant used in glassmaking producing rich blues when used in potash containing mixes, but it can also give shades of pink when used in a boro - silicate mix and green when used with iodides. 

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