diff --git a/src/mixins/collection.mixin.js b/src/mixins/collection.mixin.js
index 650d8eef..dc4df82f 100644
--- a/src/mixins/collection.mixin.js
+++ b/src/mixins/collection.mixin.js
@@ -122,15 +122,5 @@ fabric.Collection = {
       memo += current.complexity ? current.complexity() : 0;
       return memo;
     }, 0);
-  },
-
-  /**
-   * Makes all of the collection objects grayscale (i.e. calling `toGrayscale` on them)
-   * @return {Self} thisArg
-   */
-  toGrayscale: function() {
-    return this.forEachObject(function(obj) {
-      obj.toGrayscale();
-    });
   }
 };
diff --git a/src/shapes/path_group.class.js b/src/shapes/path_group.class.js
index c051e938..bfeacb02 100644
--- a/src/shapes/path_group.class.js
+++ b/src/shapes/path_group.class.js
@@ -185,18 +185,6 @@
       }, 0);
     },
 
-    /**
-      * Makes path group grayscale
-      * @return {fabric.PathGroup} thisArg
-      */
-    toGrayscale: function() {
-      var i = this.paths.length;
-      while (i--) {
-        this.paths[i].toGrayscale();
-      }
-      return this;
-    },
-
     /**
      * Returns all paths in this path group
      * @return {Array} array of path objects included in this path group