Which was the last black and white Hindi film?

It's difficult to definitively say which was the *last* black and white Hindi film, as there's no official record or established criteria. However, the general consensus points to "Gumnaam" (1965) as one of the last mainstream black and white Hindi films.

Here's why:

* Technological Shift: Color films became increasingly popular and readily available by the mid-1960s, making black and white production less common.

* "Gumnaam" was a commercially successful film, and its release marked a significant shift towards color cinema.

* Subsequent Black and White Films: While there were some black and white films released after "Gumnaam," they were mostly low-budget or experimental, not major productions.

While there might have been a few more black and white films released after "Gumnaam," it is considered a significant marker of the transition to color cinema in Hindi film.