Buenos Aires-based bookshop and publisher Eterna Cadencia has released El Libro que No Puede Esperar – which translates as ‘The Book that Cannot Wait’ – an anthology of new fiction from Latin American authors printed in ink that disappears after two months of opening the book. Silk-screened using a special pink ink, the book comes sealed in air-tight packaging that, once opened, allows the printed material to react with the atmosphere. The result is that after two months, the text vanishes. The more the text is exposed to light the faster it disappears, so unread pages may retain the text as long as the reader doesn't skip ahead in the book. The ink is made from a "secret" formula that is highly reactive with sunlight and air.