An updated version of the New Zealand passport with enhanced security features is set to be phased in by Te Tari Taiwhenua Department of Internal Affairs [DIA], Stuff reports. However, the current lack of demand for passports due to Covid-19 means not all applicants will be issued with the new and improved travel document, as the DIA is still trying to use up old passports. New features on the data page included the use of thermochromic ink, which becomes invisible at a certain temperature and reappears at the set point temperature.