Hi
Can anybody tell me why I get a bright rim when I clip this CSG difference ?
Thanks for your help !

#version 3.7;
#include "colors.inc"
#include "math.inc"

global_settings { max_trace_level 256 assumed_gamma 1.0 }

camera {
    angle 1.25
    location <0, -50, -1000>
    look_at <0,10,0>
}

object { difference { sphere { 0, 15.01  }
                      sphere { 0, 15.0 }
                    }
         clipped_by { cone { 0, 0.0, <0,50,0>, 50*tand(45) } }
         pigment { rgbt 1 }
         hollow
         interior { media { emission 0.3*White } }
      }

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