The specific instance, where this problem cropped up was: I wanted to create
a shiny metal sphere with pitted rusty areas scattered over the surface. I
used a layered texture for the shiny metal and rust respectively, but the
raytrace used only the finish values of the uppermost layer. So either I had
a dull metal or shiny rust, both of which was unsatisfying. If one could
control reflectivity with a grey image, one could overlay a corresponding
image-map and hopefully achieve much better results.

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