When a player is killed, a bloodstain is created at that location. Bloodstains start as 'fresh'. After 24 hours they become dried. Then after 4 days they become faded. Finally, bloodstains are removed at 7 days from the time of death. Bloodstains are a quick way to identify how much action has gone on in your location. Seeing a lot of fresh bloodstains would tell you many people died there in the last 24 hours. Sometimes when you see a lot of bloodstains in one location, it may be due to a group of people sleeping there are discovered and killed. This usually means human or zombie safehouses being raided.
Fresh Bloodstain - 24 hours or less Dried Bloodstain -
Older than 24 hours, less than 4 days Faded Bloodstain -
Older than 4 days, less than 7 days