diff --git a/game/characters/player/player.gd b/game/characters/player/player.gd
index da58b13..2faaad7 100644
--- a/game/characters/player/player.gd
+++ b/game/characters/player/player.gd
@@ -84,7 +84,7 @@ func _physics_process(delta: float) -> void:
 
 
 func _input(event: InputEvent) -> void:
-	if event.is_action_pressed("switch_color") and can_switch_color:
+	if event.is_action_pressed("switch_color") and can_switch_color and not particles.emitting:
 		_switch()
 
 
diff --git a/game/collision_switcher.gd b/game/collision_switcher.gd
index 7179e9a..e09f700 100644
--- a/game/collision_switcher.gd
+++ b/game/collision_switcher.gd
@@ -23,17 +23,24 @@ enum Collisions {
 enum State {
 	Black,
 	White,
+	TransitionToBlack,
+	TransitionToWhite,
 }
 
 
 const COLLISION_WHITE_SHIFT = 4
 
+const MIN_INTENSITY = 0.0
+const MAX_INTENSITY = 1.0
+
 const SHADER_SWITCH_COLORS = "shader_parameter/switch_colors"
+const SHADER_INTENSITY = "shader_parameter/intensity"
 
 
 @export var object : CollisionObject2D
 
-@export var initial_state : State = State.White
+@export_range(0.0, 60.0, 0.1) var switch_time := 0.0
+@export var initial_state := State.White
 
 
 var material : Material:
@@ -46,6 +53,8 @@ var _state : State:
 		_state = value
 		_apply_color()
 
+var _intensity_tween : Tween
+
 var _grey_layer := 0
 var _color_layer := 0
 
@@ -64,8 +73,16 @@ func _ready() -> void:
 
 
 func switch_color() -> void:
-	_state = State.Black if _state == State.White else State.White
-
+	if _intensity_tween != null and _intensity_tween.is_running(): return #TODO
+	
+	if is_zero_approx(switch_time):
+		_state = State.Black if _state == State.White else State.White
+	else:
+		_state = State.TransitionToBlack if _state == State.White else State.TransitionToWhite
+		
+		_intensity_tween = create_tween()
+		_intensity_tween.tween_method(_set_shader_internsity, 0.0, MAX_INTENSITY, switch_time)
+		_intensity_tween.finished.connect(_update_state)
 
 
 func _get_grey_collision(collision: int) -> int:
@@ -78,6 +95,18 @@ func _get_color_collision(collision: int) -> int:
 	return black_collision | white_collision
 
 
+func _set_shader_internsity(value: float) -> void:
+	material.set(SHADER_INTENSITY, value)
+
+
+func _update_state() -> void:
+	match _state:
+		State.TransitionToBlack:
+			_state = State.Black
+		State.TransitionToWhite:
+			_state = State.White
+
+
 func _apply_color() -> void:
 	var layer := 0
 	var mask := 0
@@ -89,10 +118,13 @@ func _apply_color() -> void:
 		State.White:
 			layer = _grey_layer | (_color_layer << COLLISION_WHITE_SHIFT)
 			mask = _grey_mask | (_color_mask << COLLISION_WHITE_SHIFT)
+		State.TransitionToBlack, State.TransitionToWhite:
+			layer = _grey_layer | _color_layer | (_color_layer << COLLISION_WHITE_SHIFT)
+			mask = _grey_mask | _color_mask | (_color_mask << COLLISION_WHITE_SHIFT)
 	
 	object.collision_layer = layer
 	object.collision_mask = mask
 	
 	if material != null:
-		var is_black := _state == State.Black
+		var is_black := _state == State.Black or _state == State.TransitionToBlack
 		material.set(SHADER_SWITCH_COLORS, is_black)