Bachchan plays a lawyer in the film, produced by his frequent collaborator, Shoojit Sircar.
“Work getting really tough on PINK… Scenes and the moment… days ahead are filled with apprehension!!” the 73-year-old wrote on Twitter.
“Pink” is being directed by Bengali filmmaker Aniruddha Roy Chowdhury and also stars “Baby” actress Taapsee Pannu. It is set for a September 16 release.
Shoojit has teamed up with Bachchan for the third time after their unreleased film “Shoebite” and last year’s hit “Piku”, which saw Big B bagging the best actor National Award.
PTI