Colloidion In ultrafiltration (the process of separating the colloidal particles from the solvent and soluble solutes) colloidal particles can pass through ordinary filter paper because the pores are too large These pores of filter paper can be reduced in size by impregnating with colloidion solution to stop the flow of colloidal particles The usual colloidion is a 4% solution of nitro- cellulose in a mixture of alcohol and ether An ultra-filter paper may be prepared by soaking the filter paper in a colloidion solution, hardening by formaldehyde and then finally drying it Thus, by using ultra-filter paper, the colloidal particles are separated from rest of the materials

What is collodion???

Colloidion

In ultrafiltration (the process of separating the colloidal particles from the solvent and soluble solutes) colloidal particles can pass through ordinary filter paper because the pores are too large.
These pores of filter paper can be reduced in size by impregnating with colloidion solution to stop the flow of colloidal particles.
The usual colloidion is a 4% solution of nitro- cellulose in a mixture of alcohol and ether.
An ultra-filter paper may be prepared by soaking the filter paper in a colloidion solution, hardening by formaldehyde and then finally drying it.
Thus, by using ultra-filter paper, the colloidal particles are separated from rest of the materials.

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