Screw commit history.

code/game/objects/items/kitchen.dm

@@ -22,7 +22,7 @@
 	throwforce = 0
 	throw_speed = 3
 	throw_range = 5
-	materials = list(MAT_METAL=80)
+	custom_materials = list(/datum/material/iron=80)
 	flags_1 = CONDUCT_1
 	attack_verb = list("attacked", "stabbed", "poked")
 	hitsound = 'sound/weapons/bladeslice.ogg'
@@ -65,7 +65,7 @@
 	hitsound = 'sound/weapons/bladeslice.ogg'
 	throw_speed = 3
 	throw_range = 6
-	materials = list(MAT_METAL=12000)
+	custom_materials = list(/datum/material/iron=12000)
 	attack_verb = list("slashed", "stabbed", "sliced", "torn", "ripped", "diced", "cut")
 	sharpness = IS_SHARP_ACCURATE
 	armor = list("melee" = 0, "bullet" = 0, "laser" = 0, "energy" = 0, "bomb" = 0, "bio" = 0, "rad" = 0, "fire" = 50, "acid" = 50)
@@ -104,7 +104,7 @@
 	flags_1 = CONDUCT_1
 	force = 15
 	throwforce = 10
-	materials = list(MAT_METAL=18000)
+	custom_materials = list(/datum/material/iron=18000)
 	attack_verb = list("cleaved", "slashed", "stabbed", "sliced", "torn", "ripped", "diced", "cut")
 	w_class = WEIGHT_CLASS_NORMAL
 
@@ -136,7 +136,7 @@
 	desc = "A sharpened bone. The bare minimum in survival."
 	force = 15
 	throwforce = 15
-	materials = list()
+	custom_materials = null
 
 /obj/item/kitchen/knife/combat/cyborg
 	name = "cyborg knife"
@@ -153,7 +153,7 @@
 	desc = "Unlike other carrots, you should probably keep this far away from your eyes."
 	force = 8
 	throwforce = 12//fuck git
-	materials = list()
+	custom_materials = null
 	attack_verb = list("shanked", "shivved")
 	armor = list("melee" = 0, "bullet" = 0, "laser" = 0, "energy" = 0, "bomb" = 0, "bio" = 0, "rad" = 0, "fire" = 0, "acid" = 0)