ar > ra > rañj > rā́ga in other East Indo-European languages (4)
According to Turner’s A Comparative Dictionary of the Indo-Aryan Languages, Sanskrit word rā́ga means “colour, redness,” derived from the root rañj, meaning “dye.” He also catalogues the cognates of rā́ga in other East Indo-European languages:
Pali rāga-; Prakrit rāya-; Sinhalese rā.
All these cognates and the following words related to rā́ga originate from the Tamil root ar.
rāgamatsya, a red fish. aṅgarāga, application of ointment, cosmetic. padmarāga, ruby.