Gold number is a measure of the

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(A) Lyophobic sols are more easily coagulated by the addition of suitable electrolytes. To prevent the coagulation of a lyophobic sol by the addition

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Protective action by a lyophilic colloid on a lyophobic colloid

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(A) Lyophobic sols are more easily coagulated by the addition of suitable electrolytes. To prevent the coagulation of a lyophobic sol by the addition of an electrolyte,a small amount of a lyophilic colloid is added to it. This lyophilic colloid acts as a protective colloid,and its protective power is measured in terms of the Gold number. Thus,the Gold number is a measure of the protective action of a lyophilic colloid on a lyophobic colloid.

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