A van der Waals' surface coloured according to charge, superimposed on a 3D-stick model of the boric acid molecule, H<sub>3</sub>BO<sub>3</sub>.  Red represents partially negatively charged regions, blue represents partially positively charged regions, and white represents neutral (uncharged) regions.
<a href="//commons.wikimedia.org/wiki/User:Apotashg" title="User:Apotashg">Apotashg</a>
<span class="int-own-work" lang="en">Own work</span>