diff --git a/bobassembly/changelog.txt b/bobassembly/changelog.txt
index 067a4bd9b..b5d8e7de9 100644
--- a/bobassembly/changelog.txt
+++ b/bobassembly/changelog.txt
@@ -1,4 +1,9 @@
 ---------------------------------------------------------------------------------------------------
+Version: 1.3.0
+Date: ???
+  Changes:
+    - Code tidy: Remove unnecessary global variables #178
+---------------------------------------------------------------------------------------------------
 Version: 1.2.2
 Date: 21. 02. 2024
   Changes:
diff --git a/bobassembly/info.json b/bobassembly/info.json
index 46100ecbd..4e7f9a9f9 100644
--- a/bobassembly/info.json
+++ b/bobassembly/info.json
@@ -1,6 +1,6 @@
 {
   "name": "bobassembly",
-  "version": "1.2.2",
+  "version": "1.3.0",
   "factorio_version": "1.1",
   "title": "Bob's Assembling machines mod",
   "author": "Bobingabout",
diff --git a/bobassembly/prototypes/chemical-plant-updates.lua b/bobassembly/prototypes/chemical-plant-updates.lua
index 4a409e7b7..ac813c388 100644
--- a/bobassembly/prototypes/chemical-plant-updates.lua
+++ b/bobassembly/prototypes/chemical-plant-updates.lua
@@ -91,7 +91,7 @@ if settings.startup["bobmods-assembly-chemicalplants"].value == true then
     data.raw["assembling-machine"]["chemical-plant"].icon_size = 32
     data.raw["assembling-machine"]["chemical-plant"].icon_mipmaps = nil
     data.raw["assembling-machine"]["chemical-plant"].animation =
-      bob_chemical_plant_animation({ r = 0.7, g = 0.2, b = 0.1 })
+      bobmods.bob_chemical_plant_animation({ r = 0.7, g = 0.2, b = 0.1 })
     --  data.raw["assembling-machine"]["chemical-plant"].working_visualisations = bob_chemical_plant_working_visualisations()
 
     data.raw.item["chemical-plant-2"].icon = "__bobassembly__/graphics/icons/new-colors/chemical-plant-2.png"
@@ -100,13 +100,13 @@ if settings.startup["bobmods-assembly-chemicalplants"].value == true then
       "__bobassembly__/graphics/icons/new-colors/chemical-plant-2.png"
     data.raw["assembling-machine"]["chemical-plant-2"].icon_size = 32
     data.raw["assembling-machine"]["chemical-plant-2"].animation =
-      bob_chemical_plant_animation({ r = 0.1, g = 0.5, b = 0.7 })
+      bobmods.bob_chemical_plant_animation({ r = 0.1, g = 0.5, b = 0.7 })
 
     data.raw.item["chemical-plant-3"].icon = "__bobassembly__/graphics/icons/chemical-plant-2.png"
     data.raw.item["chemical-plant-3"].icon_size = 32
     data.raw["assembling-machine"]["chemical-plant-3"].icon = "__bobassembly__/graphics/icons/chemical-plant-2.png"
     data.raw["assembling-machine"]["chemical-plant-3"].icon_size = 32
     data.raw["assembling-machine"]["chemical-plant-3"].animation =
-      bob_chemical_plant_animation({ r = 0.7, g = 0.1, b = 0.7 })
+      bobmods.bob_chemical_plant_animation({ r = 0.7, g = 0.1, b = 0.7 })
   end
 end
diff --git a/bobassembly/prototypes/chemical-plant.lua b/bobassembly/prototypes/chemical-plant.lua
index 37668a681..abdbe6c8e 100644
--- a/bobassembly/prototypes/chemical-plant.lua
+++ b/bobassembly/prototypes/chemical-plant.lua
@@ -16,7 +16,7 @@ if settings.startup["bobmods-assembly-chemicalplants"].value == true then
   data.raw.item["chemical-plant"].subgroup = "bob-chemical-machine"
   data.raw.item["chemical-plant"].order = "e[chemical-plant-1]"
 
-  function bob_chemical_plant_old_facing(tint, x)
+  local function bob_chemical_plant_old_facing(tint, x)
     return {
       layers = {
         {
@@ -70,7 +70,7 @@ if settings.startup["bobmods-assembly-chemicalplants"].value == true then
     }
   end
 
-  function bob_chemical_plant_old_animation(tint)
+  local function bob_chemical_plant_old_animation(tint)
     return {
       north = bob_chemical_plant_old_facing(tint, 0),
       east = bob_chemical_plant_old_facing(tint, 1),
@@ -79,7 +79,7 @@ if settings.startup["bobmods-assembly-chemicalplants"].value == true then
     }
   end
 
-  function bob_chemical_plant_old_working_visualisations()
+  local function bob_chemical_plant_old_working_visualisations()
     return {
       {
         north_position = util.by_pixel(30, -24),
@@ -186,7 +186,7 @@ if settings.startup["bobmods-assembly-chemicalplants"].value == true then
     }
   end
 
-  function bob_chemical_plant_fluid_boxes()
+  local function bob_chemical_plant_fluid_boxes()
     return {
       {
         production_type = "input",
@@ -217,7 +217,7 @@ if settings.startup["bobmods-assembly-chemicalplants"].value == true then
     }
   end
 
-  function bob_chemical_plant_facing(tint, offset)
+  local function bob_chemical_plant_facing(tint, offset)
     return {
       layers = {
         {
@@ -306,7 +306,7 @@ if settings.startup["bobmods-assembly-chemicalplants"].value == true then
     }
   end
 
-  function bob_chemical_plant_animation(tint)
+  function bobmods.bob_chemical_plant_animation(tint)
     return {
       north = bob_chemical_plant_facing(tint, 0),
       east = bob_chemical_plant_facing(tint, 1),
@@ -417,7 +417,7 @@ if settings.startup["bobmods-assembly-chemicalplants"].value == true then
       },
       crafting_categories = { "chemistry" },
       fluid_boxes = bob_chemical_plant_fluid_boxes(),
-      animation = bob_chemical_plant_animation({ r = 0.5, g = 0.1, b = 0.7 }),
+      animation = bobmods.bob_chemical_plant_animation({ r = 0.5, g = 0.1, b = 0.7 }),
       working_visualisations = data.raw["assembling-machine"]["chemical-plant"].working_visualisations,
       working_sound = data.raw["assembling-machine"]["chemical-plant"].working_sound,
       vehicle_impact_sound = { filename = "__base__/sound/car-metal-impact.ogg", volume = 0.65 },
@@ -451,7 +451,7 @@ if settings.startup["bobmods-assembly-chemicalplants"].value == true then
       },
       crafting_categories = { "chemistry" },
       fluid_boxes = bob_chemical_plant_fluid_boxes(),
-      animation = bob_chemical_plant_animation({ r = 0.7, g = 0.2, b = 0.1 }),
+      animation = bobmods.bob_chemical_plant_animation({ r = 0.7, g = 0.2, b = 0.1 }),
       working_visualisations = data.raw["assembling-machine"]["chemical-plant"].working_visualisations,
       working_sound = data.raw["assembling-machine"]["chemical-plant"].working_sound,
       vehicle_impact_sound = { filename = "__base__/sound/car-metal-impact.ogg", volume = 0.65 },
@@ -485,7 +485,7 @@ if settings.startup["bobmods-assembly-chemicalplants"].value == true then
       },
       crafting_categories = { "chemistry" },
       fluid_boxes = bob_chemical_plant_fluid_boxes(),
-      animation = bob_chemical_plant_animation({ r = 0.1, g = 0.7, b = 0.1 }),
+      animation = bobmods.bob_chemical_plant_animation({ r = 0.1, g = 0.7, b = 0.1 }),
       working_visualisations = data.raw["assembling-machine"]["chemical-plant"].working_visualisations,
       working_sound = data.raw["assembling-machine"]["chemical-plant"].working_sound,
       vehicle_impact_sound = { filename = "__base__/sound/car-metal-impact.ogg", volume = 0.65 },