Asahi: Gift-givers told not to iron crumpled cash
Bank of Japan officials have issued special care instructions for new banknotes that went into circulation last month: "Do not iron!" The officials said the holograms printed on the crisp new bills to prevent counterfeiting are not fully heatproof.
"We understand people may want to make wrinkled bills look brand-new (for otoshidama, money given to children at New Year's), but we recommend that they do not iron the bills too much"' BOJ officials said. Although the new bills are highly durable, the hologram, it appears, is not.
...BOJ officials are not saying exactly how much heat the notes can withstand, admitting only that ironing the 3-D image would lead to damage."Our new notes have a durability as high as, or higher than, bank notes using holograms issued in other countries, but ironing of bills is far beyond normal use," said BOJ officials. They added that the notes would not lose their value if the hologram was damaged