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What is the effect of removing the mount while it is still hot?

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in Engineering Material & Metallurgy by (773k points)
What is the effect of removing the mount while it is still hot?

(a) Instability

(b) Low strength

(c) Rough finish

(d) Opaque appearance

The question was posed to me in homework.

My question is from Metallography topic in portion Tools of the Metallurgist of Engineering Material & Metallurgy

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The correct option is (d) Opaque appearance

To elaborate: After the heating coil is removed, the cooling fins are inserted which cool the mount below 75oC in about 7 minutes. Ejecting the mold while it is hot or allowing it to cool slowly causes the mount to turn opaque.

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