1930. Single sheet on crepe paper, 184 x 120mm, printed on recto only along the outer margins, central box apparently blank - though impregnated with secret message to be revealed when heated; clean and fresh. An advertising novelty produced by the famous firm of Beecham’s. As the note along the left margin states: ‘When you suffer from colds, chills, influenza, headache, rheumatism, nerve pains, Beecham’s Powders Act like Magic’. The present curiosity is itself a magical trick to highlight the tag line. The application of a glowing piece of burned string to the central panel will reveal a secret message - which in this case appears to reveal a tortoise! A previous example, showed a chicken, with another, which though difficult to discern, incorporated the phrase ‘Beecham’s Pills’.