RedSplatter
The RedSplatter (JP: 赤い飛び散り) is a piece of evidence that can be used in the encounter against Blue and Yellow's Justice ACT.
The RedSplatter can be found in the east of the Bad Way that Punishes You upon returning from the room to the north. Alternatively, it can be obtained from Blue if not found in the overworld.
The RedSplatter is the evidence needed to accuse Aqua of the third crime in the encounter.