What effect does adding a significant quantity of platinum have on the melting point of a gold casting alloy?

Show Answers

Reduce its durability and hardening capabilityLower its resistance to tarnishingRaise its melting temperatureCause the alloy to develop a reddish hue

Explanation

Incorporating large amounts of platinum into a gold casting alloy results in an increased melting point, making option C correct. It does not reduce strength or tarnish resistance, nor does it impart a red coloration to the alloy.