Fully-saturated RGB colours, shown on both opaque and transparent 
spheres (the latter using fade_colour with varying fade_distance). Note 
the strong shift towards the primary hues in the first image as 
fade_distance decreases.

Second image shows the results of a 16-channel spectral rendering, using 
automatic generation of absorption spectra to match the RGB colours. 
Note how the shift towards the RGB primaries is somewhat lessened 
especially in the warm yellows and the blue-to-cyan range. The greens 
and purples don't seem to benefit that much; I guess some tweaking of 
the spectrum generation might help there.

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Preview of image 'test_coloured_balls_37.png'

Preview of image 'test_coloured_balls_spectral.png'