Question: what are japanese coins made of?
Answer: The 1-yen coin is made out of 100% aluminium and can float on water if placed correctly. On various occasions, commemorative coins are minted, often in gold and silver with face values up to 100,000 yen. The first of these were silver ¥100 and ¥1000 Summer Olympic coins issued on the occasion of the 1964 games.