Quote - According to the PoserSurface, you are routing both an Alt Specular and Specular_value thus multiplying that channel much higher than it needs.  Use either one, not both.  If you elect to use the node connected to the Alt_Specular, translate the values from the Specular_value to the node, zero the Specular_value and disconnect the map to it.

Thank´s for the advice but that didn´t solve it, the hair still looks smudge when rendering with "Casts shadows" on. This problem occurs whenever I try to render a transmapped hair figure/ prop, with Casts shadows on.