diff --git a/cat_win/const/colorconstants.py b/cat_win/const/colorconstants.py
index a01aea13..9825eb96 100644
--- a/cat_win/const/colorconstants.py
+++ b/cat_win/const/colorconstants.py
@@ -73,6 +73,10 @@ class ColorOptions:
     for key, _ in __Style.items():
         Style[key] = id_to_code(__Style[key])
 
+    del __Fore
+    del __Back
+    del __Style
+
 
 class CKW:
     """
diff --git a/cat_win/util/rawviewer.py b/cat_win/util/rawviewer.py
index 30a4ab65..62dfe772 100644
--- a/cat_win/util/rawviewer.py
+++ b/cat_win/util/rawviewer.py
@@ -65,7 +65,7 @@ def get_raw_view_lines_gen(file: str = '', mode: str = 'X', colors = None,
     """
     if colors is None or len(colors) < 2:
         colors = ['', '']
-    if mode not in ['x', 'X', 'b']:
+    if mode not in 'xXb':
         mode = 'X'
 
     special_chars = dict(map(lambda x: (x[0], x[2]), SPECIAL_CHARS))