Daguerreotypes, one of the earliest types of photos, produce images on silver plates that look subtly different depending on viewing angle. The optical effects are due to the presence of metallic nanoparticles in the plates, and can be considered the first realization of plasmonic color printing.

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Daguerreotypes, one of the earliest types of photos, produce images on silver plates that look subtly different depending on viewing angle. The optical effects are due to the presence of metallic nanoparticles in the plates, and can be considered the first realization of plasmonic color printing.