Where is the indigo plate for Resident Evil code veronica x?

In Resident Evil Code: Veronica X, the Indigo Plate can be found in the second-floor hallway of the mansion. Specifically, players need to access the area after obtaining the SWord Key, which allows them to unlock the door leading to the room containing the plate. After acquiring it, the Indigo Plate can be used to solve a puzzle in the game, unlocking further progression.