Titanium nitride has a striking gold colouration and is sometimes used as a plating in costume jewellery (and the extravagantly decorated vehicles of Pimp my Ride), where it has all the lustre of gold but is much more hardwearing. It is also frequently found as a coating on drill bits – the chances are if your drill appears golden, it is sporting a titanium nitride finish. Find out more about this simple but impressive compound in my latest Royal Society of Chemistry podcast about the compound that likes to pretend it's an element (TiN).  Take a listen by clicking to   pop over to its page on the RSC site .