Which one of the following elements is NOT added is small amount to be used as grain refiners ?
Correct answer: D. Indium
- A. Iridium
- B. Ruthinium
- C. Platinum
- D. Indium
Explanation
Iridium and ruthenium are potent grain refiners used in small quantities in dental casting alloys, while indium is mainly added for deoxidation and other alloying effects. Platinum improves noble-metal alloy properties but is not the expected answer here.
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