Here is a article about Purple on Business Insider: <a href="http:&#x2F;&#x2F;www.businessinsider.com&#x2F;purple-is-an-on-demand-gas-startup-2015-9" rel="nofollow">http:&#x2F;&#x2F;www.businessinsider.com&#x2F;purple-is-an-on-demand-gas-st...</a>