banknote designs worldwide since about 1996. It is added to help software detect the presence of a banknote in a digital image. Watermarks, which appear when held up to the light. Raised printing in the main image, the lettering and the value numerals on the front of the banknotes will be raised. Ultraviolet ink; the paper itself does not glow, fibres embedded in the paper do appear, and be coloured red, blue and green, the EU flag is green and has orange stars, the ECB President's, currently Mario Draghi's, signature turns green, the large stars and small circles on the front glow and the European map, a bridge and the value numeral on the back appear in yellow. Microprinting, on various areas of the banknotes there is microprinting, for example, inside the "ΕΥΡΩ" (EURO in Greek characters) on the front. The micro-text is sharp, but not blurred. A security thread, embedded in the banknote paper. The thread will appear as a dark stripe when held up to the light. The word "EURO" and the value is embedded in tiny letters on the thread. Perforations in the hologram which will form the euro symbol. There are also small numbers showing the value. A matted surface; the note paper is made out of pure cotton, which feels crisp and firm, but not limp or waxy. Barcodes, A serial number. Security features (Europa series) The 100 euro notes are made of pure cotton fibre, which improves their durability as well as giving the banknotes a distinctive feel. The printer code is positioned at the right of 9 o'clock star. Circulation The European Central Bank closely monitors the circulation and stock of the euro coins and banknotes. It is a task of the Eurosystem to ensure an efficient and smooth supply of euro notes and to maintain their integrity throughout the euro area. In December 2022, there were €100 banknotes in circulation around the euro area, with a total value of €. This is a net number, i.e. the number of banknotes issued by the Eurosystem central banks, without further distinction as to who is holding the currency issued, thus also including the stocks held by credit institutions. Besides the date of the introduction of the first set to January 2002, the publication of figures is more significant through the maximum number of banknotes raised each year. The number is higher the end of