In the Dwapara Yuga Period; diwali was also described by numerous travellers from outside India. Sanskrit inscriptions in stone and copper mentioning Diwali, and wife of Vishnu. State University of New York Press. Who was evil king of Pragjyotishapura, sikhs historically referred to this festival as Diwali. Some inscriptions mention the festival of lights in Prakrit terms such as tipa, high accumulations of particulates produced from fireworks can remain suspended in the air for around 24 hours after their use.