Where does “тёмно-синий” come from?

тёмно-синий (Russian) comes from Russian тёмный, from Proto-Slavic tьmьnъ, from Proto-Slavic tьma, from Proto-Balto-Slavic timāˀ, from Proto-Indo-European tēmH- — dark.

тёмно-синий (Russian): dark blue, navy blue

Definitions

  1. dark blue, navy blue

Ancestry of “тёмно-синий”, step by step

тёмно-синий traces back through two separate lines of ancestry.

via Russian тёмный

StepLanguageWordMeaning
1Russianтёмныйdark; ignorant, uneducated; obscure, vague
2Proto-Slavictьmьnъdark
3Proto-Slavictьmadark, darkness
4Proto-Balto-Slavictimāˀdarkness
5Proto-Indo-EuropeantēmH-dark

via Russian си́ний

StepLanguageWordMeaning
1Russianси́нийdeep blue
2Proto-Slavicsiňьblue, bluish, glaucous; gray-blue, gray
Every word from Proto-Indo-European tēmH- →Every word from Proto-Balto-Slavic timāˀ →Every word from Proto-Slavic tьma →