Porting updates related to material datums. (#12317)

* Porting updates related to material datums.

* art_type

* oh oh

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

@@ -7,6 +7,7 @@
 	blood_state = BLOOD_STATE_BLOOD
 	bloodiness = BLOOD_AMOUNT_PER_DECAL
 	color = BLOOD_COLOR_HUMAN //default so we don't have white splotches everywhere.
+	beauty = -100
 
 /obj/effect/decal/cleanable/blood/replace_decal(obj/effect/decal/cleanable/blood/C)
 	if (C.blood_DNA)
@@ -45,12 +46,14 @@
 	icon_state = "tracks"
 	desc = "They look like tracks left by wheels."
 	random_icon_states = null
+	beauty = -50
 
 /obj/effect/decal/cleanable/trail_holder //not a child of blood on purpose
 	name = "blood"
 	icon_state = "ltrails_1"
 	desc = "Your instincts say you shouldn't be following these."
 	random_icon_states = null
+	beauty = -50
 	var/list/existing_dirs = list()
 
 /obj/effect/decal/cleanable/trail_holder/update_icon()