What does the Gold Number measure? | vedclass

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It is the minimum amount of protective colloid in milligrams required to prevent the coagulation of $10 \ mL$ of a gold sol when $1 \ mL$ of $10\% \ NaCl$ solution is added.

Class 12 Chemistry Surface Chemistry Colloids, Emulsion, Gel and Their properties with application

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What does the $Gold \ Number$ measure?

A
It indicates the amount of gold present in a colloidal solution.
B
It indicates the amount of gold required to break a colloid.
C
It is the minimum amount of protective colloid in milligrams required to prevent the coagulation of $10 \ mL$ of a gold sol when $1 \ mL$ of $10\% \ NaCl$ solution is added.
D
None of the above.