diff --git a/modular_skyrat/modules/primitive_production/code/glassblowing.dm b/modular_skyrat/modules/primitive_production/code/glassblowing.dm
index 2620f6c48b1..367b8a0e413 100644
--- a/modular_skyrat/modules/primitive_production/code/glassblowing.dm
+++ b/modular_skyrat/modules/primitive_production/code/glassblowing.dm
@@ -39,6 +39,7 @@
 	desc = "A glass bowl that is capable of carrying things."
 	icon = 'modular_skyrat/modules/primitive_production/icons/prim_fun.dmi'
 	icon_state = "glass_bowl"
+	custom_materials = null
 	material_flags = MATERIAL_EFFECTS | MATERIAL_COLOR
 
 /obj/item/reagent_containers/cup/bowl/blowing_glass/Initialize(mapload)
@@ -50,6 +51,7 @@
 	desc = "A glass cup that is capable of carrying liquids."
 	icon = 'modular_skyrat/modules/primitive_production/icons/prim_fun.dmi'
 	icon_state = "glass_cup"
+	custom_materials = null
 	material_flags = MATERIAL_EFFECTS | MATERIAL_COLOR
 
 /obj/item/reagent_containers/cup/beaker/large/blowing_glass/Initialize(mapload)
@@ -61,6 +63,7 @@
 	desc = "A glass plate that is capable of carrying things."
 	icon = 'modular_skyrat/modules/primitive_production/icons/prim_fun.dmi'
 	icon_state = "glass_plate"
+	custom_materials = null
 	material_flags = MATERIAL_EFFECTS | MATERIAL_COLOR
 
 /obj/item/plate/blowing_glass/Initialize(mapload)