diff --git a/inference/core/workflows/core_steps/visualizations/background_color/v1.py b/inference/core/workflows/core_steps/visualizations/background_color/v1.py
index 824cbfb6d6..753d3992f1 100644
--- a/inference/core/workflows/core_steps/visualizations/background_color/v1.py
+++ b/inference/core/workflows/core_steps/visualizations/background_color/v1.py
@@ -90,15 +90,7 @@ def getAnnotator(
         color: str,
         opacity: float,
     ) -> sv.annotators.base.BaseAnnotator:
-        key = "_".join(
-            map(
-                str,
-                [
-                    color,
-                    opacity,
-                ],
-            )
-        )
+        key = (color, opacity)
 
         if key not in self.annotatorCache:
             background_color = str_to_color(color)
diff --git a/inference/core/workflows/core_steps/visualizations/common/utils.py b/inference/core/workflows/core_steps/visualizations/common/utils.py
index 812e2c8333..79207174a4 100644
--- a/inference/core/workflows/core_steps/visualizations/common/utils.py
+++ b/inference/core/workflows/core_steps/visualizations/common/utils.py
@@ -1,5 +1,7 @@
 import supervision as sv
 
+_COLOR_NAMES = {name for name in dir(sv.Color) if not name.startswith("_")}
+
 
 def str_to_color(color: str) -> sv.Color:
     if color.startswith("#"):
@@ -10,7 +12,7 @@ def str_to_color(color: str) -> sv.Color:
     elif color.startswith("bgr"):
         b, g, r = map(int, color[4:-1].split(","))
         return sv.Color.from_bgr_tuple((b, g, r))
-    elif hasattr(sv.Color, color.upper()):
+    elif color.upper() in _COLOR_NAMES:
         return getattr(sv.Color, color.upper())
     else:
         raise ValueError(