Invisible Blue: The Color That Ancient People Could Not See

The story of “blue being invisible in history” begins in 1858 when William Gladstone who was mystified as to why the color blue was never refered to in ancient Greek writing. Further explorations have revealed an absence of the mention of the color blue in writing from many other ancient cultures. It was as if the color did not exist.

The bizarre myth that Ancient Greeks couldn't see blue

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If ancient people couldn't perceive/had no concept of the colour blue, then how would they have viewed lapis lazuli, for example? - Quora

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Is it true that the ancient Greeks could not see blue? - Quora

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