[Polity/Science] Indelible Ink in election- Indelible Ink - contains purple black colour
- produced by Mysore paint and varnish company of the Karnataka government.
- contain silver nitrate.
- Silver nitrate is colourless but becomes visible when exposed to ultraviolet light / sunlight.
- Ink is difficult to remove at least for 72 hours.
- Used since 1951 election. Compulsory under the representations of people act 1951.
- Also exported to >25 nations.
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