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| Q. |
When was the Verneuil flame fusion method first used? |
| A. | 1207 |
| B. | 2016 |
| C. | 1503 |
| D. | 1904 |
| Answer» D. 1904 | |
| Explanation: the verneuil flame fusion method was used in 1904 for growing crystals of high melting oxides, including artificial gemstones such as ruby and sapphire. | |
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