I'm trying to model a simple glass bottle. SOR would be a fine way to do it 
but I get some odd artifacts whenever I add STURM keyword (see the scene 
below). So can STURM cause these black specks or is it a result of some 
other thing?

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global_settings{ max_trace_level 50 }

camera {
        location <5,45,-20>
        look_at <0,15,0>
}

light_source { <30,50,-50> 1 }

plane{ y,-10
        pigment { checker rgb 1 rgb 0 scale 10 }
}

sor {
     6, <5,-1>, <5,0>, <4.5,16>, <1.5,22>, <1.5,30>, <1.5,31>
     sturm
     pigment { rgbf 1 }
     interior { ior 1.5 }
}

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