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Cool and mellow. Tin, the best material for drinking vessels.
https://www.shokunin.com/en/nousaku/shuki.html

Tin transfers heat very well. Turns cool with cold sake in it, and turns moderately warm with hot sake.

Further, due to its high ion effect, it has a sterilizing and freshness-retaining function, which is why the flavor of sake becomes soft and mellow.

Tin has almost no smell of metal, and as it is harmless to human body, it can be used safely. Moreover, since it is highly acid-resistant, it doesn't rust in black alike silver, and can be handled similarly as normal vessels, thus, easy to maintain.

The gold foil is done by Ishikawa Prefecture's traditional techniques. Not to mention its use in every day drinks, your special guests would surely be deeply impressed by its brightness as well.