Euro coins edge of the €2 coin also protects it from counterfeiting. Euro coins were designed in cooperation with organisations representing blind persons, and as a result they incorporate many features allowing them to be distinguished by touch alone. In addition, their visual appearance is designed to make them easy to tell apart for persons who cannot read the inscriptions on the coins. The coins increase in size and weight with value. Of the eight denominations of euro coins, the three lowest denominations are small, resemble copper in colour and are quite thin and light. The next three denominations resemble gold in
1 euro coin country. The side cannot repeat the denomination of the coin unless the issuing country uses an alphabet other than Latin (currently, Greece is the only such country, hence "1 ΕΥΡΩ" is engraved upon its coin. Austria is currently in breach of the revised rules, but has so far not announced plans to remove "1 EURO" from its coin). Austria, Germany and Greece will at some point need to update their designs to comply with guidelines stating they must include the issuing state's name or initial, and not repeat the denomination of the coin. In addition, there are several EU states