diff --git a/pytorch3d/renderer/blending.py b/pytorch3d/renderer/blending.py
index 1816e767..0865547a 100644
--- a/pytorch3d/renderer/blending.py
+++ b/pytorch3d/renderer/blending.py
@@ -3,7 +3,7 @@
 
 
 import numpy as np
-from typing import NamedTuple
+from typing import NamedTuple, Sequence
 import torch
 
 # Example functions for blending the top K colors per pixel using the outputs
@@ -15,7 +15,7 @@ import torch
 class BlendParams(NamedTuple):
     sigma: float = 1e-4
     gamma: float = 1e-4
-    background_color = (1.0, 1.0, 1.0)
+    background_color: Sequence = (1.0, 1.0, 1.0)
 
 
 def hard_rgb_blend(colors, fragments) -> torch.Tensor:
diff --git a/tests/test_blending.py b/tests/test_blending.py
index 81f7516c..87efad60 100644
--- a/tests/test_blending.py
+++ b/tests/test_blending.py
@@ -234,3 +234,12 @@ class TestBlending(unittest.TestCase):
 
         self.assertTrue(torch.allclose(dists1.grad, dists2.grad, atol=2e-5))
         self.assertTrue(torch.allclose(zbuf1.grad, zbuf2.grad, atol=2e-5))
+
+    def test_blend_params(self):
+        """Test colour parameter of BlendParams().
+        Assert passed value overrides default value.
+        """
+        bp_default = BlendParams()
+        bp_new = BlendParams(background_color=(0.5, 0.5, 0.5))
+        self.assertEqual(bp_new.background_color, (0.5, 0.5, 0.5))
+        self.assertEqual(bp_default.background_color, (1.0, 1.0, 1.0))