Re: Human-octopus barter
Artistic/decorative pieces:
Waterproof pigments paints dyes whatever: ways to apply lasting color to things while under water. Dyes will enjoy UV protection that they don't get above water, but suffer from, well, water, as well as salt and oceanic bacteria, so they'll likely have different colourfast problems.
Ways to apply lasting scents/tastes to things, or just plain old flavor enhancers / spices.
Rock sugar, in small waterproof containers/wrappers. Rock sugar instead of granulated sugar because it will dissolve slower in the water and thus be easier to work with. That said, I have no idea if octopi can taste "carbohydraty goodness" - cats can't, as an example.
Worked stone of different varieties, some with smooth sealed surfaces to discourage plantgrowth and others with deliberately roughened surfaces to encourage plantgrowth.
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