why lyophobic colloids are called extrinsic colloids?

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Substances which do not pass into colloidal solution even on heating are called extrinsic colloids. Lyophobic colloids are solvent hating due to which they are prepared by indirect methods. A simple mixing of dispersed phase and dispersion medium doesnot lead to formation of colloidal solution. Due to this they are called extrinsic colloids.

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