A measurement standard for the gloss value
Gloss value 100 is defined as specular reflectance in incident angle of the gloss of reflectance index 1.567. With incident angle = 60°, specular reflectance is 10%, or gloss value 100. Consequently gloss in specular reflectance 100% is calculated as 1000. Reflectance in many polished metals is 50% or more, some are 90% or more. Then measurement range is expanded up to 1000 in IG-410.
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