what is gold number and write it's
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The Gold Number is the minimum weight (in milligrams) of a protective colloid required to prevent the coagulation of 10 ml of a standard hydro gold sol when 1 ml of a 10% sodium chloride solution is added to it.[1] It was first used by Richard Adolf Zsigmondy.
Gold number
125-150
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the different protecting collide differ in their protecting power zsigmondy introduced a term called gold number
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