Why does:

difference {
	blob {
		threshold 0.5
		sphere {
			<-5,5,0>, 12, 1
			pigment {color rgb <1,0,0>}
		}
		sphere {
			<5,-5,0>, 12, 0.75
			pigment {color rgb <0,0,1>} 	
		}
			
	}
	box {
		<-100,100,0>,
		<100,-100,-100>
	}
	cutaway_textures 
}

come out black? Note: The help (section 6.7.10) suggests the box
should have no texture.

I can get a blue sliced blob if I do the following:

difference {
	blob {
		threshold 0.5
		sphere {
			<-5,5,0>, 12, 1
		}
		sphere {
			<5,-5,0>, 12, 0.75
		}
		pigment {color rgb <0,0,1>} 		
	}
	box {
		<-100,100,0>,
		<100,-100,-100>
	}
	cutaway_textures 
}

but this ain't what I want.

Note: Whilst going through the various permutations with this I came
across this one:

difference {
	blob {
		threshold 0.5
		sphere {
			<-5,5,0>, 12, 1
			pigment {color rgb <1,0,0>} 		
		}
		sphere {
			<5,-5,0>, 12, 0.75
			pigment {color rgb <0,0,1>} 		
		}
		
	}
	box {
		<-100,100,0>,
		<100,-100,-100>
		pigment {color rgb <0,1,0>}
	}
	cutaway_textures
	translate <-5,0,0> 
}

Which will make POV balk and stop with:
	Rendering Error: No textures in multi-texture CSG object.
	Returned from renderer with error status


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