Iron concretion with a ball of pitch in it from the wreck of the East Indies' t Vliegend Hart; The object is probably a ball of pitch. Pek was obtained from tar distillation. Boiling pitch that falls in water takes on a round shape. Pek was part of the harpuis. Harpuis is a mixture of linseed oil; resin; sulfur and fat. Mixed with pitch it was used for caulking. Caulking is the process in which the seam between e.g. waterproof two shelves. Tar; pitch; Dutch East India Company; 't Vliegend Hart (ship); c. 1700 - c. 1735; d 2 cm