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The following end-on pictures were taken of a scintillating fiber and a light guide segment under a microscope, after the ends have been polished using office paper.  From these pictures, it is difficult to discern any difference between multi-clad fiber and single-clad.  The scintillating fiber (light blue-green tint) is multi-clad, whereas the light guide in these photographs is single-cladding fiber.

The following end-on pictures were taken of a scintillating fiber and a light guide segment under a microscope, after the ends have been polished using office paper.  From these pictures, it is difficult to discern any difference between multi-clad fiber and single-clad.  The scintillating fiber (light blue-green tint) is multi-clad according to the manufacturer Saint-Gobain, whereas the light guide in these photographs is single-cladding fiber.

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