Hi all:

As strange as it sounds, these two renderings use the exact same 
radiosity settings, and the same lighting (no light_sources, only a 
tricky image_map function onto a surrounding sphere).

The only difference is an extra texture layer for the lathe objetcs. It 
started as a dust layer, but accidentally resulted into an artifact cleaner:

texture{
  pigment{
   wrinkles
   color_map{
    [0.0 rgbt 1]
    [0.0 rgbt .9]
   }
  }
}

I've still to test if this works more generally, not only for lathe 
objetcs, but I wanted to share this strange but useful "effect". If I 
can isolate it I will post a minimal scene later.

--
Jaime

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