The pink-purple coloration is a result of the absorption by the bigger particles when the eco-friendly coloration is attributed to The sunshine scattering by colloidal dispersions of Ag nanoparticles using a sizing > 40 nm. The Lycurgus cup is identified as one of many oldest artificial nanomaterials [one]. The same https://www.directivepublications.org/journal-of-applied-nanoscience/