MNT 5000, 10,000 and 20,000 banknotes are the most counterfeited currencies in Mongolia. The aim of the Bank of Mongolia is to upgrade the level one security features of these currencies. The first currency to be upgraded is MNT 5000 banknotes. The key security feature is that it is impossible to imitate the technology or it will be costly to counterfeit. There is a 3D Rainbow effect security feature on the Soyombo Emblem of the main side of the note, which helps in identifying fake notes unaided eyes. The renewed banknotes will be put into circulation in the first quarter of 2019 with the relevant decree of the BoM President. The previous notes will also be used with the old ones.