Intaglio printing (printing using engraved plates) is one of the most secure printing techniques available. It requires considerable investment due to the specialised equipment used and the requirement of a skilled engraver. Intaglio printing is most commonly used in the printing of banknotes and other, high value documents. It is capable of producing very fine lines of print, in a range of shades and colours. The ink is raised and can be felt by running a fingertip over it, allowing easy verification of authenticity. Chan Wanich Security Printing Co. Ltd is the only company in Thailand that is capable of printing using this technique.