> But the highlights on the ribs even now show only up at high resolutions 
> like the 2400 by 1800 image from which the section with the volume pedal 
> is cut - and even then there is still an interference pattern!

Hmm ... the structure does seem to be rather fine. Did you render
with anti-aliasing? And as other have suggested, try using a dark
grey instead of black for the color. Of course, you can also try
to make a duller (wider) highlight (phong_size or roughness).

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