Ca. 900-1100 AD A hefty, mold-formed pottery hand grenade with an acorn-shaped body, a rounded shoulder, and a narrow mouth. Grenades like this were meant to hold the famed and highly combustible substance known as "Greek fire," though its exact composition is unknown; scholars posit that the mixture was composed of pine resin, naphtha, quicklime, and sulphur. Size: L:106mm / W:91mm ; 435g Provenance: Private UK collection; From an old London collection formed in the 1990s.