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Which colour is obtained by copper alloys, when nickel is added to it?

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in Casting-Forming-Welding II by (119k points)
Which colour is obtained by copper alloys, when nickel is added to it?

(a) Red

(b) Blue

(c) Silver

(d) Yellow

I have been asked this question by my college director while I was bunking the class.

I'm obligated to ask this question of Copper Alloys topic in division Foundry Introduction & Materials of Casting-Forming-Welding II

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Right option is (c) Silver

For explanation I would say: None.

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