What is the Reflectivity Index and what is the index for various colours, particularly silver?
“Reflectivity Index” is not a term commonly used in color science. It probably refers to the luminous reflectance factor, or CIE Y tristimulus value. The value itself depends on the measurement geometry and can range from 0-1 (or 0 -100%). A good silver surface, measured in a total reflectance geometry, might have a reflectance factor as high as 0.98 (98%) or so.
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