They might also have a use for gold, so long as it is already worked into something decorative or useful. Gold doesn't tarnish much, and it looks nice, so it could be seen as a high-status decoration - perhaps even more so than on land, given its probable rarity to them. Decorative glassware might also be handy, and things like gemstones. Practical goods are admittedly more of a problem since, aluminium aside, much of what humans make won't survive long in salt water.
-- Trotsky Gamer and Skeptic ------------------------------------------------------ Trotsky's RPG website: http://www.ttrotsky.pwp.blueyonder.co.uk/ Not a Dead Communist: http://jrevell.blogspot.com/
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