I have a layered texture.  Pigment is transparent in some places so lower layers
show through.  I can't map the texture because then I can't layer them.  If I
apply an irid finish to each layer, they add up and wash out the texture.  If I
apply irid at then end, outside a texture block, only the top-most texture picks
it up.  If I apply it inside a texture block, it doesn't work with the layered
normals.  Is there a way to simply apply an iridescent finish to the whole
texture?

 - Ricky

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