The crimson-purple shade is because of the absorption by the bigger particles whilst the eco-friendly coloration is attributed to The sunshine scattering by colloidal dispersions of Ag nanoparticles by using a sizing > 40 nm. The Lycurgus cup is identified as one of the oldest synthetic nanomaterials [one]. A similar https://www.directivepublications.org/journal-of-applied-nanoscience/