Suparn Verma admits that no filmmaker can guarantee that the audience will love his film ... Sanjay Gupta is known to look towards foreign films for inspiration. So which one was the muse for Acid Factory? Sanjay had this amazing story given to him by a writer about seven people trapped inside an acid factory. They?ve lost their memories and in the terrifying present have just realised that there?s a killer amongst them and two others are his intended victims. We wove the screenplay around it. The challenge was in shooting the film in sequence and extracting performances from the group as a whole and not simply from individual actors. Before shooting, I made my cast read out their parts in front of each other and that created a bond between them.