diff --git a/modules/MathJax/extensions/TeX/texvc.js b/modules/MathJax/extensions/TeX/texvc.js
index d506867..c39ced5 100644
--- a/modules/MathJax/extensions/TeX/texvc.js
+++ b/modules/MathJax/extensions/TeX/texvc.js
@@ -7,6 +7,22 @@ MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
 
   var MML = MathJax.ElementJax.mml;
 
+  /*
+   *  Get an RGB color (a triplet of values between 0 and 255)
+   */
+  MathJax.Extension["TeX/color"].get_RGB = function (rgb) {
+    rgb = rgb.split(/,/); var RGB = "#";
+    if (rgb.length !== 3) {this.TEX.Error("RGB colors require 3 decimal numbers")}
+    for (var i = 0; i < 3; i++) {
+      if (!rgb[i].match(/^(\d{1,3})$/)) {this.TEX.Error("Invalid decimal number")}
+      var n = parseInt(rgb[i], 10);
+      if (n < 0 || n > 255) {this.TEX.Error("RGB values must be between 0 and 255")}
+      n = n.toString(16); if (n.length < 2) {n = "0"+n}
+      RGB += n;
+    }
+    return RGB;
+  }
+
   MathJax.Hub.Insert(MathJax.InputJax.TeX.Definitions,{
 
     mathchar0mi: {