diff --git a/packages/core/src/Switch/__tests__/Switch.interaction.browser.spec.ts b/packages/core/src/Switch/__tests__/Switch.interaction.browser.spec.ts
index 3a596bbf5d70c..358101bf3cd16 100644
--- a/packages/core/src/Switch/__tests__/Switch.interaction.browser.spec.ts
+++ b/packages/core/src/Switch/__tests__/Switch.interaction.browser.spec.ts
@@ -28,6 +28,7 @@ import {
   armHold,
   blockMainThread,
   compareCurve,
+  controlColor,
   cubicBezier,
   countBetween,
   advanceFrozenPage,
@@ -38,6 +39,7 @@ import {
   installPageFreeze,
   installTimerGate,
   markElement,
+  MARKER_RGB,
   openStory,
   releaseAnimations,
   seekAnimations,
@@ -53,6 +55,7 @@ import {
   traceRendering,
   trackControl,
   trackMarker,
+  trackMarkers,
   waitForRest,
   withStorybook,
   writeEvidence,
@@ -2359,11 +2362,13 @@ test.describe('Switch touch presentation (UISwitch, iOS 26.2), under a finger',
     castFrames: Parameters<typeof trackMarker>[1],
     starts: [number, number],
   ): Promise<ClockedFrame[]> {
-    const pageTime = pageTimesOnControls(await trackControl(page, castFrames), {
-      ahead: await trackControl(page, castFrames, {ahead: true}),
+    const [control, ahead, tracked] = await trackMarkers(page, castFrames, {
+      colors: [controlColor(), controlColor({ahead: true}), MARKER_RGB],
+    });
+    const pageTime = pageTimesOnControls(control, {
+      ahead,
       controlStarts: starts,
     });
-    const tracked = await trackMarker(page, castFrames);
     const shown = tracked.filter(
       (f): f is typeof f & {box: NonNullable<typeof f.box>} =>
         f.box != null && f.box.width > 0 && f.box.height > 0,
@@ -3305,8 +3310,9 @@ test.describe('Switch touch presentation (UISwitch, iOS 26.2), under a finger',
       // The red channel's mean in an 8 px square: a scalar on x. With both
       // controls, a WebKit proof judges each frame at its time on the
       // controls' clock, at display rate.
-      const control = await trackControl(page, read);
-      const ahead = await trackControl(page, read, {ahead: true});
+      const [control, ahead] = await trackMarkers(page, read, {
+        colors: [controlColor(), controlColor({ahead: true})],
+      });
       const colour = await trackBrightness(page, read, {...probe, size: 8});
       runs.push({
         tracked: colour,
diff --git a/packages/core/src/Tooltip/__tests__/TooltipClosedTriggerAnchor.interaction.browser.spec.ts b/packages/core/src/Tooltip/__tests__/TooltipClosedTriggerAnchor.interaction.browser.spec.ts
index d8ae7437d9e70..36535e388505a 100644
--- a/packages/core/src/Tooltip/__tests__/TooltipClosedTriggerAnchor.interaction.browser.spec.ts
+++ b/packages/core/src/Tooltip/__tests__/TooltipClosedTriggerAnchor.interaction.browser.spec.ts
@@ -21,12 +21,13 @@ import {
 import {
   blockMainThread,
   busyWindowProof,
+  controlColor,
   markElement,
+  MARKER_RGB,
   openStory,
   startBusyControl,
   startScreencast,
-  trackControl,
-  trackMarker,
+  trackMarkers,
   withStorybook,
 } from '@astryxdesign/interaction-harness';
 
@@ -89,8 +90,9 @@ test('a surface around a closed tooltip trigger keeps moving through a 500 ms ma
   });
   await page.waitForTimeout(150);
   const frames = await cast.stop();
-  const tracked = await trackMarker(page, frames);
-  const control = await trackControl(page, frames);
+  const [tracked, control] = await trackMarkers(page, frames, {
+    colors: [MARKER_RGB, controlColor()],
+  });
   // Judged against the compositor control in the same frames: the surface
   // moves on every frame the control does.
   const proof = busyWindowProof(tracked, block, {settledWithin: 2, control});