diff --git a/core/palettes/TwentyTwenties.tid b/core/palettes/TwentyTwenties.tid
index e4003b67e..cbb064eb9 100644
--- a/core/palettes/TwentyTwenties.tid
+++ b/core/palettes/TwentyTwenties.tid
@@ -51,7 +51,6 @@ alert-background: [function[colour],[base-secondary]]
 alert-border: [tf.interpolate-colours[base-ink],[alert-background],[0.6]]
 alert-highlight: [tf.interpolate-colours[base-ink],[base-primary],[0.3]]
 alert-muted-foreground: [tf.interpolate-colours[base-ink],[alert-background],[0.4]]
-?alert-contrast: [tf.check-colour-contrast[alert-background],[foreground],[45]]
 background: [function[colour],[base-paper]]
 blockquote-bar: [function[colour],[muted-foreground]]
 button-background:
@@ -60,7 +59,6 @@ button-border:
 code-background: [tf.interpolate-colours[base-paper],[base-tertiary],[0.1]]
 code-border: [tf.interpolate-colours[base-paper],[base-tertiary],[0.6]]
 code-foreground: [function[colour],[base-tertiary]]
-?code-contrast: [tf.check-colour-contrast[code-background],[code-foreground],[45]]
 diff-delete-background: [function[colour],[base-red]]
 diff-delete-foreground: [function[colour],[foreground]]
 diff-equal-background:
@@ -87,7 +85,6 @@ external-link-foreground-visited: [function[colour],[primary]]
 external-link-foreground: [function[colour],[primary]]
 footnote-target-background: [tf.interpolate-colours[base-paper],[base-ink],[0.2]]
 foreground: [function[colour],[base-ink]]
-?background-foreground-contrast: [tf.check-colour-contrast[background],[foreground],[45]]
 highlight-background: [tf.interpolate-colours[base-paper],[base-yellow],[0.5]]
 highlight-foreground: [tf.interpolate-colours[base-yellow],[base-ink],[0.8]]
 message-background: [tf.interpolate-colours[base-paper],[base-blue],[0.2]]
diff --git a/core/palettes/background/contrast-tests.tid b/core/palettes/background/contrast-tests.tid
new file mode 100644
index 000000000..c6aa8d6b1
--- /dev/null
+++ b/core/palettes/background/contrast-tests.tid
@@ -0,0 +1,7 @@
+title: $:/palettes/background/contrast-tests
+type: application/x-tiddler-dictionary
+tags: $:/tags/BackgroundPalette
+
+?background-foreground-contrast: [tf.check-colour-contrast[background],[foreground],[45]]
+?alert-contrast: [tf.check-colour-contrast[alert-background],[foreground],[45]]
+?code-contrast: [tf.check-colour-contrast[code-background],[code-foreground],[45]]