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. 2015 May 5;5:9842. doi: 10.1038/srep09842

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(a) Design principle of forward and reverse barcode using PE derivatives. (b) An ideal two-layer design of hidden barcode over a currency. Layers (L₁ and L₂) are composed of PE3 and PE1 respectively. (c) Simulated experiment to generate a forward barcode using PE1 coated and PE3 coated papers. The virtual barcode in the initial stages (1–3) remain undetected using a smart phone having barcode reader application. Upon complete wetting of PE1 layer (4) a smart phone with a barcode reader (NeoReader) application can read the encoded message ‘Satyameva Jayate’ meaning ‘Truth Alone Triumphs’.