Well, all fibers change the color of the light somehow. Because of the physical characteristics of the conductor, some frequencies transmit with less impediment than others do and it is impossible to produce a fiber that would have the same attenuation on the whole of the visible spectrum. To carry on a light conductor to transmit millions of different wavelengths along with exactly the same attenuation in every one would be quite unreasonable. A few fibers absorb a little more blue than red and less green than yellow and others just the opposite. Then, the bit and tone of the light varies from meter to meter, in some cases very apparently. This phenomenon is referred to as selective spectral absorption.
All fibers change the color of the light somehow. Because of the physical characteristics of the conductor, some frequencies transmit with less impediment than others do and it is impossible to produce a fiber that would have the same attenuation on the whole of the visible spectrum.
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