<p>If you didn't know, Pure Gold is a soft metal. So soft that even the simple act of biting it would left a mark on it. </p><p>Before all these technologies that test the authenticity of metals were invented, peope used an old technique to determine if the metal they have is of pure-quality or not by biting on it. If it leaves a mark, it is pure gold, if not then it is only a metal alloy colored like gold.</p><p>Over time, it somewhat became a tradition and an iconic pose because of how the media seemingly force it on the olympic winners as it looks more good on paper compared to the old plain victory pose.</p>