Blood is more to the rusty side instead of red side when on parchment. If it is really old blood then it'll be faded with a darker ring around the edge but not a perfect ring, a random fat part and skinny part ring. If it is fresh blood then it'll be dark and shiny reflecting light or dried blood would be crusty. There won't be any blurring unless someone has brushed their sleeve through it or the map is made from a thick absorbent cloth. I don't if there are any splatter or blood brushes around the internet for PSP but there are thousands for PS.