In most metals, the plasma frequency is in the ultraviolet, making them shiny (reflective) in the visible range.- Hallucinogen (Wikipedia)
Hallucinogens are a large and diverse class of psychoactive drugs that can produce altered states of consciousness characterized by major alterations in thought, mood, and perception as well as other changes. Most hallucinogens can be categorized as either being psychedelics, dissociatives, or deliriants.