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Which of the following is of special value in testing the purity of butter and desi-ghee?

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Which of the following is of special value in testing the purity of butter and desi-ghee?

(a) Acid number

(b) Iodine number

(c) Saponification number

(d) Richert-Meissl number

I had been asked this question in an interview.

This intriguing question originated from Oils and Fats in section Industrially Important Materials of Engineering Chemistry II

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Right option is (d) Richert-Meissl number

The explanation: Richert-Meissl number is of special value in testing the purity of butter and desi-ghee. It is an indicator of how much volatile fatty acid can be extracted from fat through saponification.

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