The color blue or at least a word for the color blue does not exist in ancient texts. Other colors are mentioned, but not blue.
If the color blue did not exist then, how can it exist now?
What “ancient texts” are you referring to? The ancient Greeks, Romans, Egyptians, Hebrews, Persians, and Indians all had words for blue.
Maybe they had a word for blue but it was sacred and tabblue to talk about it.