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| Q. |
Which of the following imparts deep blue colour to glass? |
| A. | Cobalt oxide |
| B. | Cupric oxide |
| C. | Ferrous oxide |
| D. | Nickel oxide |
| Answer» D. Nickel oxide | |
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Explanation: Glass colouring and colour marking may be obtained by addition of colouring ions, by precipitation of nanometer sized colloides (so-called striking glasses such as "ruby gold" or red "selenium ruby"), by coloured inclusions (as in milk glass and smoked glass). |
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