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Which of the following is not a property of an ideal preservative used for the preservation of stones?

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Which of the following is not a property of an ideal preservative used for the preservation of stones?

(a) It should be highly economical

(b) It should allow moisture to penetrate the surface of the stone

(c) It should be harmless

(d) It should be non-corrosive

I had been asked this question in homework.

The query is from Stones in section Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

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The correct choice is (b) It should allow moisture to penetrate the surface of the stone

Explanation: An ideal preservative used for the preservation of stones should be highly economical. It should be harmless and non-corrosive. It should not allow moisture to penetrate the surface of the stone.

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