New research by the Israel Antiquities Authority has identified a unique linen (from flax) wick, of the type used for Sabbath lamps in Mishnaic times, 1,500 years ago. It was originally found in excavations conducted in the 1930s by the American Colt expedition to the Negev site of Shivta.
http://www.jewishpress.com/news/israel/one-of-oldest-wicks-in-the-world-uncovered/2018/12/10/
https://www.timesofisrael.com/tiny-1500-year-old-flax-lamp-wick-illuminates-ancient-jewish-law/