Which has least gold number

Which has least gold number

Options

(a) Gelatin
(b) Starch
(c) Albumin
(d) Blood

Correct Answer:

Gelatin

Explanation:

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  • weight of the dried protective agent in milligrams,which when added to 10 ml of standard gold sol (0.0053 to 0.0058) is just sufficient to prevent the color change from red to blue on the addition of 1 ml of 10% sodium chloride solution, is equal to gold number of the protective colloid.

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