diff --git a/environments/factory/simple_factory_getting_dirty.py b/environments/factory/simple_factory_getting_dirty.py
index e966475..346b53c 100644
--- a/environments/factory/simple_factory_getting_dirty.py
+++ b/environments/factory/simple_factory_getting_dirty.py
@@ -39,7 +39,7 @@ class GettingDirty(BaseFactory):
             height, width = self.state.shape[1:]
             self.renderer = Renderer(width, height, view_radius=2)
 
-        dirt   = [Entity('dirt', [x, y], min(self.state[DIRT_INDEX, x, y], 1), 'scale')
+        dirt   = [Entity('dirt', [x, y], min(1.1*self.state[DIRT_INDEX, x, y], 1), 'opacity')
                   for x, y in np.argwhere(self.state[DIRT_INDEX] > h.IS_FREE_CELL)]
         walls  = [Entity('dirt', pos) for pos in np.argwhere(self.state[h.LEVEL_IDX] > h.IS_FREE_CELL)]
         agents = [Entity('agent1', pos) for pos in np.argwhere(self.state[h.AGENT_START_IDX] > h.IS_FREE_CELL)]