USES OF HAND-PICKING METHOD
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The quantity of the mixture is small.
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The unwanted substance is present in smaller quantities and the size, shape, or colour of the unwanted substance is different from that of the useful one.
Sieving:
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It is a simple and convenient method of separating particles of different sizes.
e.g.: A small sieve is used for sifting flour.
It has small holes which allow only very fine flour particles to pass through.
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The smaller component passes through the pores of the sieve whereas the larger component is left behind in it.
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There are different types of sieves which are used in cooking:
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Flour sifter: It is used in baking.
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Colander: A bowl shaped sieve is used as a strainer in cooking.
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Mesh strainer: It consists of a fine metal mesh screen on a metal frame.