Kevin & Frank: Can I add my own experience with heating coffee in our microwave ?: Certain iron rich clay cups will get hot as heck with luke warm coffee inside, while the other more "pure" clays and glass cups don't --while their contained coffee rises to near boil in 30 odd seconds. U wave bands are admittedly not in the IR band widths but it seems to offer a certain parallel here, in the discussion of emissivity/ reflectance, or no ? Richard Stanley
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