Where does “unblacken” come from?

unblacken (English) comes from English blacken, from English -en, from Middle English -en, from Old English -en, from Old Norse -inn, from Proto-Norse -īna-, from Proto-Germanic -īnaz, from Proto-Indo-European -iHnos — adjectival suffix.

unblacken (English): To undo the blackening of; to make no longer black

Definitions

  1. To undo the blackening of; to make no longer black

Ancestry of “unblacken”, step by step

unblacken traces back through two separate lines of ancestry.

via English blacken

StepLanguageWordMeaning
1EnglishblackenTo cause to be or become black; To become black;...
2English-enDenotes the past participle form when attached to...
3Middle English-enDenotes the past participle form when attached to...
4Old English-enmæġþ + API → mæġden; cocc + API → cycen, cicen;...
5Old Norse-innUsed to create adjectives from nouns, meaning...
6Proto-Norse-īna-
7Proto-Germanic-īnaz-en
8Proto-Indo-European-iHnosCreates adjectives of materials
9Proto-Indo-European-no-adjectival suffix

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Proto-Indo-European -no-Every word from Middle English -enEvery word from English -en