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. 2009 May 7;1(5-6):345–362. doi: 10.1039/b905502a

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Fig8 — Polystyrene beads fabricated using combinations of different styrene monomers (A) are arranged in wells on a substrate (B), and scanned in steps, taking a Raman spectrum at each step. Each bead (C) is then associated with a particular spectrum (D), as indicated by the corresponding colour codes. Each Raman spectrum constitutes a code identifying a bead (reprinted from ref. 38, copyright 2007, with permission from Elsevier).