A scientific analysis of mysterious amulets dated back to 3,000 BC has brought new information to light about ancient metallurgy techniques. One copper amulet is the earliest lost-wax cast object known in history. According to Phys.org, a team of researchers has a new explanation about technologies used for copper amulet production in the third millennium BC. By using a novel UV-visible photoluminescence spectral imaging approach, they could detail the parameters of the production process - such as the purity of the copper and melting and solidification temperatures. The collection of small amulets was discovered in 1985 at the archaeological site of Mehrgarh in today's Balochistan in western Pakistan. The researchers believe that the amulets may have been created for religious
