A complete 18th-century grenade was recovered from the shipwreck of the <i>Culloden</i>. It was made of a cast iron carcass with a wooden fuse filled with nonmetal powder. The conservation process had to be designed around those two incompatible materials but after a ten-month display, the fuse loosened due to shrinkage and separated from the carcass. This part was then treated with 19 alkaline sulfite reduction baths and the fuse was pretreated by the acetone-rosin method for waterlogged wood (Bryce et al. 1975). (Editor's note: Extreme care should be exercised when dealing with old, unexploded ordnance.) -- AATA