URL copied Know Amitabh Bachchan's definition of a good friend Bollywood star and icon Amitabh Bachchan on Sunday offered the definition of a good friend. The actor said a good friend could be compared to white colour and explained why he feels this way. "Good friends are like white color, if you mix any color in white, a new colour can be formed. But even if all colours of the world are mixed together, it cannot create white," Amitabh Bachchan wrote in Hindi. Last week, the veteran actor took to social media to celebrate his film "Black" completing 16 years of its release date. Talking about the Sanjay Leela Bhansali directorial, Big B (also referred to Amitabh Bachchan) said "Black" is a movie that was made way ahead of its time.