Per a request in p.b.i., here's the rust texture I used on my copycat
nut:

// Begin POV code

#declare Rust2=
 texture {
  pigment {
   bozo
   turbulence 0.9
   color_map {
    [0.00 rgbf<0.5, 0.5, 0.7, 1>]
    [0.22 rgbf<0.6, 0.2, 0.1, 1>]
    [0.35 rgbf<0.3, 0.0, 0.0, 0.95>]
    [0.65 rgbf<1, 0.6, 0.0, 0.85>]
    [0.85 rgbf<0.8, 0.3, 0.0, 0.75>]
    [0.95 rgbf<0.6, 0.2, 0.0, 0.95>]
    [1.00 rgbf<0.4, 0.0, 0.0, 0.55>]
   }
  }
  normal {
   bozo 12.5
   turbulence 0.9
  }
  finish {
   specular 0.13
   roughness 0.6
  }
  scale 0.2
 }
 texture {
  pigment {
   bozo
   turbulence 0.9
   color_map {
    [0.00 rgbf<0.5, 0.5, 0.7, 0.95>]
    [0.22 rgbf<0.6, 0.2, 0.1, 0.95>]
    [0.35 rgbf<0.3, 0.0, 0.0, 0.9>]
    [0.65 rgbf<1, 0.6, 0.0, 0.8>]
    [0.85 rgbf<0.8, 0.3, 0.0, 0.7>]
    [0.95 rgbf<0.6, 0.2, 0.0, 0.9>]
    [1.00 rgbf<0.4, 0.0, 0.0, 0.5>]
   }
  }
  normal {
   bozo 12.5
   turbulence 0.9
  }
  finish {
   specular 0.13
   roughness 0.6
  }
  scale 0.25
 }
 texture {
  pigment {
   bozo
   turbulence 0.9
   color_map {
    [0.00 rgbf<0.5, 0.5, 0.7, 0.9>]
    [0.22 rgbf<0.6, 0.2, 0.1, 0.9>]
    [0.35 rgbf<0.3, 0.0, 0.0, 0.85>]
    [0.65 rgbf<1, 0.6, 0.0, 0.75>]
    [0.85 rgbf<0.8, 0.3, 0.0, 0.65>]
    [0.95 rgbf<0.6, 0.2, 0.0, 0.85>]
    [1.00 rgbf<0.4, 0.0, 0.0, 0.45>]
   }
  }
  normal {
   bozo 12.5
   turbulence 0.9
  }
  finish {
   specular 0.13
   roughness 0.6
  }
  scale 0.3
 }
 texture {
  pigment {
   bozo
   turbulence 0.9
   color_map {
    [0.00 rgbf<0.5, 0.5, 0.7, 0.85>]
    [0.22 rgbf<0.6, 0.2, 0.1, 0.85>]
    [0.35 rgbf<0.3, 0.0, 0.0, 0.8>]
    [0.65 rgbf<1, 0.6, 0.0, 0.7>]
    [0.85 rgbf<0.8, 0.3, 0.0, 0.6>]
    [0.95 rgbf<0.6, 0.2, 0.0, 0.8>]
    [1.00 rgbf<0.4, 0.0, 0.0, 0.4>]
   }
  }
  normal {
   bozo 12.5
   turbulence 0.9
  }
  finish {
   specular 0.13
   roughness 0.6
  }
  scale 0.35
 }
 texture {
  pigment {
   bozo
   turbulence 0.9
   color_map {
    [0.00 rgbf<0.5, 0.5, 0.7, 0.8>]
    [0.22 rgbf<0.6, 0.2, 0.1, 0.8>]
    [0.35 rgbf<0.3, 0.0, 0.0, 0.75>]
    [0.65 rgbf<1, 0.6, 0.0, 0.65>]
    [0.85 rgbf<0.8, 0.3, 0.0, 0.55>]
    [0.95 rgbf<0.6, 0.2, 0.0, 0.75>]
    [1.00 rgbf<0.4, 0.0, 0.0, 0.35>]
   }
  }
  normal {
   bozo 12.5
   turbulence 0.9
  }
  finish {
   specular 0.13
   roughness 0.6
  }
  scale 0.4
 }
 texture {
  pigment {
   bozo
   turbulence 0.9
   color_map {
    [0.00 rgbf<0.5, 0.5, 0.7, 0.75>]
    [0.22 rgbf<0.6, 0.2, 0.1, 0.75>]
    [0.35 rgbf<0.3, 0.0, 0.0, 0.7>]
    [0.65 rgbf<1, 0.6, 0.0, 0.6>]
    [0.85 rgbf<0.8, 0.3, 0.0, 0.5>]
    [0.95 rgbf<0.6, 0.2, 0.0, 0.7>]
    [1.00 rgbf<0.4, 0.0, 0.0, 0.3>]
   }
  }
  normal {
   bozo 12.5
   turbulence 0.9
  }
  finish {
   specular 0.13
   roughness 0.6
  }
  scale 0.45
 }

// End POV code

David
--
Keeper of the family pets.
"You want fish? I got fish. I got fish, and eels, and turtles, and
snails, and frogs, and dragons and cats..."

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