To add to your point on curry leaves:
> Curry leaf” comes from the Tamil word “karu-vep-ilai” (‘black neem leaf’), leaves of the sweet neem plant Murraya koenigii
> Curry leaf” comes from the Tamil word “karu-vep-ilai” (‘black neem leaf’), leaves of the sweet neem plant Murraya koenigii
Similarly the etymology of Krishna (the deity) is both considered “dark” or “black” depending on whom you ask.
I suspect it may be a case where our languages at the time didn’t need to delineate between black and a dark colour. Tone/shade was a relative unlike hue.