diff --git a/gridlock/read.py b/gridlock/read.py
index 4f39432..28afdd2 100644
--- a/gridlock/read.py
+++ b/gridlock/read.py
@@ -182,7 +182,7 @@ class GridReadMixin(GridPosMixin):
             plane = Plane(**plane)
 
         if pcolormesh_args is None:
-            pcolormesh_args = {}
+            pcolormesh_args = dict(alpha=0.8, colors='gray')
 
         grid_slice = self.get_slice(
             cell_data = cell_data,