In the movie Promising Young Woman, the main character--Cassie--is shown seeking out encounters with men who think she is very drunk and then confronting them in a sober manner when they try to have sex with her without her consent. Two such encounters are shown in detail on screen, and neither results in violence. After these two detailed encounters, she is shown writing the mens' names down in a notebook, using blue or black ink. The number of names suggest that she has been doing this frequently--at least weekly--for a number of years (suggested to be 7-8 years later in the film).
While most of the names in the book are black or blue, a significant percentage are shown to be red. There is one encounter that is not shown on screen--although there is a brief snippet of the man's dialogue commenting on her hairstyle--and she writes that man’s name in red in her book after that encounter. Red suggests to me the possibility of an encounter turned violent, but this is not specified and Cassie is not shown to arm herself for these encounters or to ever have raised the suspicion of her parents with marks of violence on her body.
If there is any explanation for the different colored inks, either in the film that I missed or explained outside the film by the writer or director or someone else in the know?