Not all of Boulton's innovations proved successful. Together with painter Francis Eginton, he created a process for the mechanical reproduction of paintings for middle-class homes, but eventually abandoned the procedure. Boulton and James Keir produced an alloy called "Eldorado metal" that they claimed would not corrode in water and could be used for sheathing wooden ships. After sea trials the Admiralty rejected their claims, and the metal was used for fanlights and sash windows at Soho House. Boulton feared that construction of a nearby canal would damage his water supply, but this did not prove to be the case, and in 1779 he wrote, "Our navigation goes on prosperously; the junction with the Wolverhampton Canal is complete, and we already sail to Bristol and to Hull."