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non-luminous colour
colour perceived to belong to an area that appears to be transmitting or diffusely reflecting light as a secondary light source
Note 1 to entry:
Secondary light sources seen in their natural surroundings normally exhibit the appearance of non-luminous colours in this sense.
Note 2 to entry: This entry was numbered 845-02-23 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-818 in CIE S 017:2011.