just need items to actually have their overlays, ree

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

@@ -9,7 +9,7 @@
 	color = BLOOD_COLOR_HUMAN //default so we don't have white splotches everywhere.
 
 /obj/effect/decal/cleanable/blood/replace_decal(obj/effect/decal/cleanable/blood/C)
-	if (C.blood_DNA)
+	if(length(C.blood_DNA))
 		blood_DNA |= C.blood_DNA.Copy()
 	if (bloodiness)
 		if (C.bloodiness < MAX_SHOE_BLOODINESS)
@@ -52,7 +52,6 @@
 	desc = "Your instincts say you shouldn't be following these."
 	random_icon_states = null
 	var/list/existing_dirs = list()
-	var/list/Blood_DNA = list()
 
 /obj/effect/decal/cleanable/trail_holder/update_icon()
 	color = blood_DNA_to_color()
@@ -83,7 +82,6 @@
 	var/exited_dirs = 0
 	blood_state = BLOOD_STATE_BLOOD //the icon state to load images from
 	var/list/shoe_types = list()
-	var/list/shoe_printer = list()
 
 /obj/effect/decal/cleanable/blood/footprints/Crossed(atom/movable/O)
 	if(ishuman(O))
@@ -114,10 +112,6 @@
 /obj/effect/decal/cleanable/blood/footprints/update_icon()
 	..()
 	cut_overlays()
-
-	if(shoe_printer)
-		color = shoeblood_DNA_to_color(shoe_printer)
-
 	for(var/Ddir in GLOB.cardinals)
 		if(entered_dirs & Ddir)
 			var/image/bloodstep_overlay = GLOB.bloody_footprints_cache["entered-[blood_state]-[Ddir]"]
@@ -155,29 +149,6 @@
 		return TRUE
 	return FALSE
 
-/obj/effect/decal/cleanable/blood/footprints/proc/shoeblood_DNA_to_color(list/blood_dna)	//handles RGB colorings of bloody shoes
-	var/list/colors = list()//first we make a list of all bloodtypes present
-	for(var/bloop in shoe_printer)
-		if(colors[shoe_printer[bloop]])
-			colors[shoe_printer[bloop]]++
-		else
-			colors[shoe_printer[bloop]] = 1
-
-	var/final_rgb = BLOOD_COLOR_HUMAN
-
-	if(colors.len)
-		var/sum = 0 //this is all shitcode, but it works; trust me
-		final_rgb = bloodtype_to_color(colors[1])
-		sum = colors[colors[1]]
-		if(colors.len > 1)
-			var/i = 2
-			while(i <= colors.len)
-				var/tmp = colors[colors[i]]
-				final_rgb = BlendRGB(final_rgb, bloodtype_to_color(colors[i]), tmp/(tmp+sum))
-				sum += tmp
-				i++
-
-	return final_rgb
 /* Eventually TODO: make snowflake trails like baycode's
 /obj/effect/decal/cleanable/blood/footprints/tracks/shoe
 	name = "footprints"