"These premises developed in response to the colonial need to manipulate the Indians’ perception of their past. The need was felt most strongly from the middle of the nineteenth century onwards, and an elaborate racist framework, in which the interrelationship between race, language and culture was a key element, slowly emerged as an explanation of the ancient Indian historical universe. The measure of its success is obvious from the fact that the Indian nationalist historians left this framework unchallenged, preferring to dispute it only in some comparatively minor matters of detail."
January 1, 1970
https://en.wikiquote.org/wiki/Historical_definitions_of_races_in_India