With reference to a paper published by J. H. Leow (see this Bibliography Vol. 31, No. 1, 12 E67-00463), it is pointed out that polishing produces a surface layer whose properties, such as reflectivity, may differ from theoretical properties of the same material. Differences of several percent in reflectivity can be created in silver by different polishing methods. Cleavage surfaces of sphalerite have reflectivity different from that of polished surfaces.

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