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Gleitsmann Security Inks (GSI) has been a trusted manufacturer and provider of highly secure, durable and efficient inks for government entities worldwide since 1847. The company has been based in Berlin since 1953. In 2023 the IN Groupe (owned by the French government with headquarter in Paris) acquired 100% of the shares of Gleitsmann Security Inks GmbH. GSI continuously strives to improve its products, meeting the latest requirements from its Central Bank, State Printwork and Commercial Security printing customers.