Definitions from Wiktionary (colour bar)

▸ noun:  The segregation of people of different colour or race, especially any barrier to black people participating in activities with white people.
▸ noun:  (printing) A pattern of varying tonal density that enables visual and numeric comparisons to be made across multiple printed sheets or pages.
▸ noun:  (jewelry) A layer of good jewellery-quality opal within a rough opal.
▸ Also see colour_bar


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