diff --git a/js/concentration/view/ParticleNode.ts b/js/concentration/view/ParticleNode.ts
deleted file mode 100644
index 9544b4fe..00000000
--- a/js/concentration/view/ParticleNode.ts
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright 2013-2022, University of Colorado Boulder
-
-/**
- * ParticleNode is the base class for drawing a particle.
- * Origin is at the center of the particle.
- *
- * @author Chris Malley (PixelZoom, Inc.)
- */
-
-import ModelViewTransform2 from '../../../../phetcommon/js/view/ModelViewTransform2.js';
-import { Rectangle } from '../../../../scenery/js/imports.js';
-import beersLawLab from '../../beersLawLab.js';
-import SoluteParticle from '../model/SoluteParticle.js';
-
-export default class ParticleNode extends Rectangle {
-
-  public readonly particle: SoluteParticle;
-
-  public constructor( particle: SoluteParticle, modelViewTransform: ModelViewTransform2 ) {
-
-    const viewSize = modelViewTransform.modelToViewDeltaX( particle.size );
-
-    super( -viewSize / 2, -viewSize / 2, viewSize, viewSize, {
-      fill: particle.color,
-      stroke: particle.color.darkerColor(),
-      lineWidth: 1
-    } );
-
-    this.particle = particle;
-
-    this.rotation = particle.orientation;
-
-    particle.positionProperty.link( () => {
-      this.translation = modelViewTransform.modelToViewPosition( particle.positionProperty.value );
-    } );
-  }
-}
-
-beersLawLab.register( 'ParticleNode', ParticleNode );
\ No newline at end of file