page_title: Indonesian rupiah
section_title: Security features
hierarchical_section_title: Indonesian rupiah / Banknotes / Security features
caption_attribution_description: Approximately 2,000,000 Indonesian Rupiah laid out on my floor.
context_page_description: The rupiah is the official currency of Indonesia. Issued and controlled by Bank Indonesia, its ISO 4217 currency code is IDR. The name "rupiah" is derived from the Sanskrit word for silver, rupyakam. Sometimes, Indonesians also informally use the word "perak" in referring to rupiah. The rupiah is divided into 100 sen, although inflation has rendered all coins and banknotes denominated in sen obsolete.
  Introduced in 1946 by Indonesian nationalists fighting for independence, the currency replaced a version of the Netherlands Indies gulden, which had been introduced during the Japanese occupation in World War II. In its early years, the rupiah was used in conjunction with other currencies, including a new version of the gulden introduced by the Dutch.
  The Riau islands and the Indonesian half of New Guinea had their own variants of the rupiah in the past, but these were subsumed into the national rupiah in 1964 and 1971, respectively.
context_section_description: The basic materials of the banknotes are long fibres from any kind of wood, or a mix of different types of wood. However, the preferable material is abacá fibre, which is naturally plentiful in Indonesia and is believed to increase the durability of the banknotes. The banknotes are heat-processed to create a unique type of pulp.
  The minimum security features visible to the naked eye are watermarks, electrotypes, and security threads with colour fibres. Extra features may be included, such as holograms, Irisafe, iridescent stripes, clear windows, metameric windows, and gold patches.
  Watermark and electrotype are made by controlling the gap of density of the fibres, which create certain images for the banknotes. This is done to raise the aesthetic quality of the notes.
  Security threads are inserted into the note so that horizontal and vertical lines are shown from top to bottom. The threads can be varied in the materials, size, colour, and design.
  Intaglio printing is used for the denomination numbers in the banknote, to help blind people recognise genuine notes and their denomination.
  The 10,000-rupiah note of 2010 and the 20,000-, 50,000-, and 100,000-rupiah notes of 2011 introduced several new security features: use of EURion constellation rings, rainbow printing designed to change colour when viewed from different angles, and tactile features for blind people and those with visual difficulties to recognise the different denominations of the notes.
caption: Collection of 50,000-rupiah bills clearly displaying the security threads
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