diff --git a/core/block.js b/core/block.js
index f462c2f29..b896ac84b 100644
--- a/core/block.js
+++ b/core/block.js
@@ -256,22 +256,6 @@ Blockly.Block.prototype.hue_ = null;
  */
 Blockly.Block.prototype.colour_ = '#000000';
 
-/**
- * Secondary colour of the block.
- * Colour of shadow blocks.
- * @type {?string}
- * @private
- */
-Blockly.Block.prototype.colourSecondary_ = null;
-
-/**
- * Tertiary colour of the block.
- * Colour of the block's border.
- * @type {?string}
- * @private
- */
-Blockly.Block.prototype.colourTertiary_ = null;
-
 /**
  * Name of the block style.
  * @type {?string}