I'm making a bottle. It looks like glass of course. And I have a problem -
the part of the bottle between its wide and narrow cylinders (actually
difference of two cones) looks like very strange. It seems to be not
transparent at all. In addition its color is blue while the color of bottle
is gray. Whats my fault?
The code of the bottle:

union {
  difference {
    cylinder {
      <0, 0, 0>, <0, 2, 0>, 0.5
    }
    cylinder {
      <0, 0.1, 0>, <0, 2.1, 0>, 0.45
    }
  }
// problem place starts...
  difference {
    cone {
      <0, 2, 0>, 0.5, <0, 2.5, 0>, 0.2
    }
    cone {
      <0, 1.9, 0>, 0.51, <0, 2.6, 0>, 0.09
    }
  }
// ... ends
  difference {
    cylinder {
      <0, 2.5, 0>, <0, 3, 0>, 0.2
    }
    cylinder {
      <0, 2.4, 0>, <0, 3.1, 0>, 0.15
    }
  }
  texture {
    pigment {
    color rgbf <0.95, 0.95, 0.95, 0.92>
    }
    finish {
      ambient 0.05
      diffuse 0.05
      reflection 0.2
      specular 0.2
      roughness 0.005
    }
  }
  interior {
    ior 1.5
  }
  translate <-1, 1, 0.5>
}

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