Can someone give me some examples of different peptization process?

​For eg.  
AgI + KI -> Negative Colloid
Here I-  adsorbs on the surface of AgI.

I want some more examples like this.

Dear Student,

Some more examples are :Peptization of freshly precipitated ferric hydroxide with ferric chloride solutionFe3+ is absorbed on Fe(OH)3A precipitate of AgCl on shaking with dilute solution of AgNO3 adsorbs Ag+ ionAddition very dil. HCl to freshly precipitated Al(OH)3

Regards,

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