Ok, turn on IDL.  Make a blue or pink or whatever object using the diffuse channel.  Put it right next to a white one.  Render.  The white object will have some blue or pink on it.  Instead of diffuse, use reflection.  No pink or blue will show up on the white object.

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)