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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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