Short answers, pulled from the story.
Light with a dominant wavelength of roughly 495 to 570 nanometers evokes the sensation we call green. The human eye contains cone cells that trigger this perception when stimulated more than other color receptors.
Ancient Egyptian artists ground malachite mined from west Sinai to create vibrant green pigments for tomb paintings. King Tutankhamun's paintbox contained finely crushed malachite mixed with yellow ochre and blue azurite.
The 1835 invention of chrome green by Parisian chemist Pannetier offered a stable alternative that replaced older mineral dyes. This development provided a solution to the instability issues found in earlier pigments like verdigris.
The first recorded green party formed in Constantinople during the 6th century Byzantine Empire as opponents of the Blue faction supporting Emperor Justinian I. Rioting erupted between factions after one race in 532 AD leading to massacres and destruction of much central Constantinople.
In Europe and the United States, 47 percent of respondents linked green directly to natural environments while only 18 percent chose white. Surveys conducted across American, European, and Islamic countries show green most commonly associates with nature, life, health, youth, spring, hope, and envy.