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Diffuse Color – Controls the diffuse component of the shader. Use this for materials made out of cloth threads or other non-translucent fibers, as well as for dirty hair.  Note that clean hair or fur  does not  normally have a diffuse component, so in that case leave the parameter black.  

Diffuse Amount  – The amount for the diffuse component of the material.

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Note that real-world hair or fur does not have a diffuse component. Although the diffuse parameter allows for some artistic control, for realistic results it is best to disable it by leaving the Diffuse Color black.

 

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The primary specular component corresponds to light that is reflected off the outer surface of hair strands (see the figure above).

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