A method is disclosed for providing a digital emergency card, the method including a user creating (S1) the digital emergency card for a building (2) and storing (S2) the created emergency card in a storage medium (4) of the building (2). In addition, the method includes reading (S3) the stored emergency card from the storage medium (4) and transmitting (4) the emergency card, once read. Furthermore, a system is disclosed which consists of a storage medium (4), a terminal (6), and a transmission and receptions device (8), the system being designed to carry out steps of such a method.

(b) There is provided a method of making an optically readable PDF coating composition, the method comprising increasing the entropy of the coating composition by adding an optically readable material and optionally a solvent to at least two portions of the coating composition and then combining the portions of the coating composition.