However, their 1990 studio album, The Razors Edge, brought them back into the spotlight, reaching 5x multi-platinum in the US alone and selling between 10 and 12 million copies worldwide. Over the next 10 years AC/DC released two other studio albums, Ballbreaker and Stiff Upper Lip, which confirmed their renewed popularity and success. After a lengthy eight-year hiatus, AC/DC returned with a new studio album, Black Ice. Black Ice debuted at number 1 in 29 countries and was certified multi-platinum in 14 of those, becoming one of their most successful albums worldwide, and was followed by a hugely successful world tour. In 2010, AC/DC released an album of songs used for the Iron Man 2 soundtrack they had put together; this reached number one in many countries around the world, including the UK, and number four in the US. Malcolm Young confirmed in 2011 that AC/DC were working on a 16th studio album.