The latest variant, as shown in p.b.i, using the same scratch image_map, 
results from the following code:

//start code
#version 3.8;

global_settings {
   assumed_gamma 1.0
   radiosity {
     pretrace_start 0.08
     pretrace_end   0.004
     count 50, 1000
     nearest_count 10, 5
     error_bound 1
     recursion_limit 1
     low_error_factor .3
     gray_threshold 0.0
     minimum_reuse 0.015
     maximum_reuse 0.1
     brightness 1

     adc_bailout 0.01/2
     normal on
     media off
     always_sample off
     //max_sample 1.0
   }
}

camera {
   location  <0, 100, 0>
   look_at   <0, 0, 0>
   direction z
   right     x*image_width/image_height
   angle     54
}

light_source {
   <0,0,0>
   color rgb <1, 1, 1>*1
   translate <0, 10e6, 0>
}

sky_sphere {
   pigment {
     gradient y
     color_map {
       [0.0 rgb <0.6,0.7,1.0>*0.7]
       [0.7 rgb <0.0,0.1,0.8>*0.7]
     }
   }
}

#local N_scratch =
normal {
   bump_map {png "scratches.png" gamma 1}
   rotate 90*x
}

#local Strength = -1;

plane {
   y, 0
   material {
     texture {
       pigment {srgb <1.00, 0.62, 0.28>}
       finish {
         diffuse albedo 0.01
         brilliance 1
         specular albedo 0.7
         roughness 0.00001
         metallic on
         fresnel on
         reflection {0.0, 0.9 metallic on fresnel on}
         conserve_energy
       }
     }
     interior {
       ior 1.5
     }
   }
   material {
     texture {
       pigment {srgbt <1.00, 0.62, 0.28, 1>}
       normal {
         average
         normal_map {
           [1.0 N_scratch scale 50 rotate  30*y bump_size 1.0*Strength]
           [0.5 N_scratch scale 40 rotate  60*y bump_size 0.8*Strength]
           [0.4 N_scratch scale 30 rotate  90*y bump_size 0.6*Strength]
           [0.3 N_scratch scale 20 rotate -90*y bump_size 0.4*Strength]
           [0.2 N_scratch scale 10 rotate -60*y bump_size 0.2*Strength]
           [0.1 N_scratch scale 1  rotate -30*y bump_size 0.1*Strength]
         }
       }
       finish {
         diffuse albedo 0.01
         brilliance 1
         specular albedo 0.1
         roughness 0.001
         metallic on
         fresnel off
         reflection {0.0, 0.9 metallic on fresnel on}
         conserve_energy
       }
     }
     interior {
       ior 1.5
     }
   }
}
//end code

-- 
Thomas

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