bunch of fixes

code/game/objects/items/crayons.dm

@@ -115,7 +115,7 @@
 	if(M == user)
 		to_chat(user, "You take a bite of the crayon and swallow it.")
 		user.nutrition += 1
-		user.reagents.add_reagent("crayon_dust",min(5,uses)/3)
+		user.reagents.add_reagent(REAGENT_ID_CRAYONDUST,min(5,uses)/3)
 		if(uses)
 			uses -= 5
 			if(uses <= 0)
@@ -201,7 +201,7 @@
 	if(M == user)
 		to_chat(user, "You take a bite of the marker and swallow it.")
 		user.nutrition += 1
-		user.reagents.add_reagent("marker_ink",6)
+		user.reagents.add_reagent(REAGENT_ID_MARKERINK,6)
 		if(uses)
 			uses -= 5
 			if(uses <= 0)

code/game/objects/items/weapons/material/bats.dm

@@ -14,16 +14,16 @@
 
 //Predefined materials go here.
 /obj/item/material/twohanded/baseballbat/metal/New(var/newloc)
-	..(newloc,"steel")
+	..(newloc,MAT_STEEL)
 
 /obj/item/material/twohanded/baseballbat/uranium/New(var/newloc)
-	..(newloc,"uranium")
+	..(newloc,MAT_URANIUM)
 
 /obj/item/material/twohanded/baseballbat/gold/New(var/newloc)
-	..(newloc,"gold")
+	..(newloc,MAT_GOLD)
 
 /obj/item/material/twohanded/baseballbat/platinum/New(var/newloc)
-	..(newloc,"platinum")
+	..(newloc,MAT_PLATINUM)
 
 /obj/item/material/twohanded/baseballbat/diamond/New(var/newloc)
-	..(newloc,"diamond")
+	..(newloc,MAT_DIAMOND)

code/game/objects/items/weapons/paint.dm

@@ -29,7 +29,7 @@ var/global/list/cached_icons = list()
 /obj/item/reagent_containers/glass/paint/Initialize()
 	.=..()
 	if(paint_type)
-		reagents.add_reagent("paint", volume, paint_type)
+		reagents.add_reagent(REAGENT_ID_PAINT, volume, paint_type)
 
 /obj/item/reagent_containers/glass/paint/red
 	icon_state = "paint_red"