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Protective Colloids-Gold Number

On addition of a small amount of lyophilic sol to a lyophobic sol, the former exerts a protecting influence on the latter against coagulation by electrolyte. For example, a gold sol or a silver sol protected by gelatin, gum-arabic, or egg albumin may not be coagulated easily. Different lyophilic sols exert protective influence to different extent. The protecting power of a protective colloid is expressed in terms of Gold number defined as “the number of milligram of the protective colloid that just prevents coagulation of 10 mL of standard gold sol when 1 mL of 10% solution of NaCI is added to it is called Gold number of the protective colloid.

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