when did the use of iron began in the subcontinent
Iron Age The history of metallurgy in the Indian subcontinent began during the 2nd millennium BC. Archaeological sites in India, such as Malhar, Dadupur, Raja Nala Ka Tila and Lahuradewa in present-day Uttar Pradesh show iron implements in the period 1800–1200 BC.[7] Archaeological excavations in Hyderabad show an Iron Age burial site.[38] Rakesh Tewari[39] believes that around the beginning of the Indian Iron Age (13th century BC), iron smelting was widely practiced in India. Such use suggests that the date of the technology's inception may be around the 16th century BC.[7]
Arsenic The word arsenic has its origin in the Syriac word ܠܐ ܙܐܦܢܝܐ (al) zarniqa,[35] from the Persian word زرنيخ zarnikh, meaning "yellow" (literally "gold-colored") and hence "(yellow) orpiment". It was adopted into Greek as arsenikon (ἀρσενικόν), a form that is folk etymology, being the neuter form of the Greek word arsenikos (ἀρσενικός), meaning "male", "virile". The Greek word was adopted in Latin as arsenicum, which in French became arsenic, from which the English word arsenic is taken.[35] Arsenic sulfides (orpiment, realgar) and oxides have been known and used since ancient times.[36] Zosimos (circa 300 AD) describes roasting sandarach (realgar) to obtain cloud of arsenic (arsenic trioxide), which he then reduces to metallic arsenic.[37] As the symptoms of arsenic poisoning were somewhat ill-defined, it was frequently used for murder until the advent of the Marsh test, a sensitive chemical test for its presence. (Another less sensitive but more general test is the Reinsch test.) Owing to its use by the ruling class to murder one another and its potency and discreetness, arsenic has been called the "poison of kings" and the "king of poisons".[38]