This piece of amusement turned out to have a useful side effect. The painting shows relatively dull sails, not the bright red of our crimson sails, so I tried to use tan sails, then ran a FreePlay as a Cursed character. The curse turned the sails ragged and also white. Crimson sails stayed crimson when cursed, tan sails didn't. A Windows search for "sail_torn_red", to find out what red sails were doing and tan sails weren't, showed that I'd missed something when I created tan sails. "NK.c" has a function "GetCharacterCursedSails" which assigns torn textures based on the original sail texture and if there isn't one defined for that sail texture, it defaults to white. With a suitable line added for tan sails, it now curses them properly.