So here we go.

I took my Granite_21 array for Dakota Red and extracted colour pairs. I 
also changed the reflection block because I guess the original 
reflection is way too strong. I used the reflection as given in 
Granite_21. A couple of further, inconsequential, changes et voilà.

This is the finish block I used:

   finish {
     diffuse albedo 0.5 brilliance 1.5
     specular albedo 0.9 roughness 0.0025
     fresnel on
     reflection {0.1  fresnel on}
     conserve_energy
   }

I used 10 layers and scaled the final texture on the object. I could 
also have used much more layers (e.g. 100) and scale the texture 
somewhat less, with a similar result but a bit more confused imo.

Again, this is a great piece of work, Dave! I need to dig deeper now. ;-)

-- 
Thomas

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