diff --git a/main_package/classes/importer.py b/main_package/classes/importer.py
index 8d2fcdb..d92c779 100644
--- a/main_package/classes/importer.py
+++ b/main_package/classes/importer.py
@@ -74,7 +74,6 @@ class Importer():
 
          """
         cols = df.columns.values[2:-1]
-        print(cols)
         df.drop(cols, axis=1, inplace=True)
 
     def drop_unneccessary_columns_in_all_frames(self):
diff --git a/main_package/classes/node.py b/main_package/classes/node.py
index 96ddc36..8ab6c45 100644
--- a/main_package/classes/node.py
+++ b/main_package/classes/node.py
@@ -1,4 +1,9 @@
+from enum import Enum
 
+class Color(Enum):
+    WHITE = 0
+    GRAY = 1
+    BLACK = 2
 
 class Node():
     """
@@ -7,11 +12,13 @@ class Node():
     del nodo stesso nel grafo rappresentato attraverso la matrice di adiacenza.
     :state_id: UID del nodo
     :node_id: int
+    :color: indica che il nodo sia stato visitato o meno durante la successiva BFS visit
     """
 
-    def __init__(self, state_id, node_id=-1):
+    def __init__(self, state_id, node_id=-1, color=Color.WHITE):
         self.state_id = state_id
         self.node_id = node_id
+        self.color = color
 
     def __key(self):
         return (self.state_id)
@@ -34,4 +41,6 @@ class Node():
         return NotImplemented
 
     def __repr__(self):
-        return "<%s, %d>"% (self.state_id, self.node_id)
\ No newline at end of file
+        return "<%s, %d, %s>"% (self.state_id, self.node_id, self.color)
+
+