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1. Gold Sols

   Linked via "localized surface plasmon"

   Optical Properties and Surface Plasmon Resonance (SPR)
   The defining characteristic of gold sols is their intense color, which arises from the phenomenon of Localized Surface Plasmon Resonance (LSPR). When light strikes the metallic nanoparticles, the free electrons on the particle surface oscillate collectively at a characteristic frequency, corresponding to the particle's [localized surface plasmon](/entries/localized-surfa…