Porting forensics from Aurora.

code/game/objects/effects/decals/Cleanable/humans.dm

@@ -22,6 +22,19 @@ var/global/list/image/splatter_cache=list()
 	var/amount = 5
 	var/drytime
 
+/obj/effect/decal/cleanable/blood/reveal_blood()
+	if(!fluorescent)
+		fluorescent = 1
+		basecolor = COLOR_LUMINOL
+		update_icon()
+
+/obj/effect/decal/cleanable/blood/clean_blood()
+	fluorescent = 0
+	if(invisibility != 100)
+		invisibility = 100
+		amount = 0
+		processing_objects -= src
+
 /obj/effect/decal/cleanable/blood/Destroy()
 	for(var/datum/disease/D in viruses)
 		D.cure(0)

code/game/objects/effects/decals/Cleanable/tracks.dm

@@ -29,6 +29,13 @@ var/global/list/image/fluidtrack_cache=list()
 		src.basecolor=_color
 		src.wet=_wet
 
+/obj/effect/decal/cleanable/blood/tracks/reveal_blood()
+	if(!fluorescent)
+		if(stack && stack.len)
+			for(var/datum/fluidtrack/track in stack)
+				track.basecolor = COLOR_LUMINOL
+		..()
+
 // Footprints, tire trails...
 /obj/effect/decal/cleanable/blood/tracks
 	amount = 0

code/game/objects/effects/decals/cleanable.dm

@@ -1,6 +1,9 @@
 /obj/effect/decal/cleanable
 	var/list/random_icon_states = list()
 
+/obj/effect/decal/cleanable/clean_blood()
+	qdel(src)
+
 /obj/effect/decal/cleanable/New()
 	if (random_icon_states && length(src.random_icon_states) > 0)
 		src.icon_state = pick(src.random_icon_states)