If you've ever bought a bar of Imperial Leather soap, you've probably noticed that the product is topped with a small label that has the brand's name printed on it.
And you'll also know that no matter how many times you wash your hands the label is almost impossible to remove, as it stays firmly stuck in place even when the bar of soap has reduced down to a tiny sliver.
While the debate over the real reason for the label has raged on for decades, the truth has now finally been revealed - and it has a much more practical use than many people thought.
