diff --git a/inference/core/workflows/core_steps/visualizations/common/base_colorable.py b/inference/core/workflows/core_steps/visualizations/common/base_colorable.py
index 2fe26c356b..d37012d536 100644
--- a/inference/core/workflows/core_steps/visualizations/common/base_colorable.py
+++ b/inference/core/workflows/core_steps/visualizations/common/base_colorable.py
@@ -18,6 +18,24 @@
 )
 from inference.core.workflows.prototypes.block import BlockResult
 
+_MPL_PALETTES_R = {
+    "Greys_R",
+    "Purples_R",
+    "Blues_R",
+    "Greens_R",
+    "Oranges_R",
+    "Reds_R",
+    "Wistia",
+    "Pastel1",
+    "Pastel2",
+    "Paired",
+    "Accent",
+    "Dark2",
+    "Set1",
+    "Set2",
+    "Set3",
+}
+
 
 class ColorableVisualizationManifest(PredictionsVisualizationManifest, ABC):
     color_palette: Union[
@@ -124,23 +142,7 @@ def getPalette(self, color_palette, palette_size, custom_colors):
         else:
             palette_name = color_palette.replace("Matplotlib ", "")
 
-            if palette_name in [
-                "Greys_R",
-                "Purples_R",
-                "Blues_R",
-                "Greens_R",
-                "Oranges_R",
-                "Reds_R",
-                "Wistia",
-                "Pastel1",
-                "Pastel2",
-                "Paired",
-                "Accent",
-                "Dark2",
-                "Set1",
-                "Set2",
-                "Set3",
-            ]:
+            if palette_name in _MPL_PALETTES_R:
                 palette_name = palette_name.capitalize()
             else:
                 palette_name = palette_name.lower()
diff --git a/inference/core/workflows/core_steps/visualizations/halo/v1.py b/inference/core/workflows/core_steps/visualizations/halo/v1.py
index fee318d842..71cb7b3648 100644
--- a/inference/core/workflows/core_steps/visualizations/halo/v1.py
+++ b/inference/core/workflows/core_steps/visualizations/halo/v1.py
@@ -103,17 +103,12 @@ def getAnnotator(
         opacity: float,
         kernel_size: int,
     ) -> sv.annotators.base.BaseAnnotator:
-        key = "_".join(
-            map(
-                str,
-                [
-                    color_palette,
-                    palette_size,
-                    color_axis,
-                    opacity,
-                    kernel_size,
-                ],
-            )
+        key = (
+            color_palette,
+            palette_size,
+            color_axis,
+            opacity,
+            kernel_size,
         )
 
         if key not in self.annotatorCache: