Ca. 100-300 AD. Roman. A translucent unguentarium with a piriform body, sloping shoulders, tubular neck, and flared mouth resolving in a folded rim. Most striking is the shimmering rainbow iridescence presenting hues of purple, blue violet, green, pink, and sky blue. Unguentaria, like alabastra in ancient Greece, were vessels used to store perfume or toilet oil in the Roman period. Excellent condition. For similar items, see Stern E. M. (2001). Roman, Byzantine, and Early Medieval Glass. Ostfildern: Hatje Cantz, 241; also: https://www.christies.com/lot/lot-6009448/?intObjectID=6009448. Size: L:160mm / W:50mm ; 52g. Provenance: From the private collection of Mr. R. Unger; previously with a London gallery; acquired in the 1970s on the UK art market.