Here is the MegaPov code.

#declare Scarring =
texture {pigment {bozo color_map {[0 rgb .175 transmit .875][1 rgb .175
transmit 1]}scale 2}}
texture {pigment {bozo pigment_map {[0 bozo color_map {[0 rgb .125 transmit
.667][1 rgb .125 transmit 1]}scale .125][.5 rgb .175 transmit 1]}scale
2}translate 25}

#declare HullTexture =
texture {
pigment {
crackle metric 1
color_map {
[0 rgb .75]
[1 rgb 1.5 ]
}
scale 1/4
scale <1,1,3>
}
normal {crackle metric 1 scale 1/3 scale <1,1,3> bump_size 1/2}
finish {ambient 0 phong 1.5 metallic}
}
texture {Scarring scale 2*z scale .25}
texture {Scarring scale 2*z scale .5}
texture {Scarring scale 2*z scale .5}
texture {Scarring scale 2*z scale 1}

Where  the two color_map entries are the maximum and minimum colors for the
texture.  Enjoy! ;->

--
H.E. Day

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