diff --git a/viridispalettes.py b/viridispalettes.py
index 62b2695..22a564e 100644
--- a/viridispalettes.py
+++ b/viridispalettes.py
@@ -179,14 +179,14 @@ def _by_chain_patch(self_cmd, sele):
         [0, '', ''],
         [0, '', ''],
         [1, by_chain_col + '(elem C)',
-            'util.color_chains("('+sele+' and elem C)", palette="viridis", _self=cmd)'],
+            'cmd.spectrum(expression="chain", selection="('+sele+') & elem C", palette="viridis", _self=cmd)'],
         [1, by_chain_col + '(*/CA)',
-            'util.color_chains("('+sele+' and name CA)", palette="viridis", _self=cmd)'],
+            'cmd.spectrum(expression="chain", selection="('+sele+') & name CA", palette="viridis", _self=cmd)'],
         [1, by_chain_col,
-            'util.color_chains("('+sele+')", palette="viridis", _self=cmd)'],
+            'cmd.spectrum(expression="chain", selection="('+sele+')", palette="viridis", _self=cmd)'],
         [0, '', ''],
         [1, chainbows_col,
-            'util.chainbow("('+sele+')", palette="viridis", _self=cmd)'],
+            'util.chainbow(selection="('+sele+')", palette="viridis", _self=cmd)'],
         [0, '', ''],
         [1, by_segi_col + '(elem C)',
             'cmd.spectrum("segi", "viridis", "('+sele+') & elem C")'],