> Now I am rendering the image at 20, resp. 5. Hope that helps...

It may or may not solve the problem, but it will help. Also the adc_bailout
comes in handy. If you adjust these values, you should be able to get rid of
black pixels and avoid slowing down rendering too much.

If the value in MTL is reached, the pixel will turn black, because the real
color of the pixel could not be found within the allowed attempts (in your
case 10 or 20). If the reflections on a surface goes on and on - as certain
spots in your bowl keeps reflecting back and forth - it may be a good idea
to allow the maximum number of attempts (which is 256).

The adc_bailout tries to prevent that rendering slows down a lot. It only
allows reflections to continue when they matter. By default this value is
1/255 but you could try something like 1/64. It may add a tad of noise, but
nothing bad.

Regards,
Hugo

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