Alas, the trick with the color math does NOT work in DAZ|Studio, Poser 4, Pro Pack, or Poser Artist. What you CAN do is take the head texture map into Photoshop/PSP, add the "shadow mask image" as a second layer, multiply the layers and save as a new head texture map, one that you only apply to the nostril material.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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