Explained: Why Navratna's 'Thanda Thanda Cool Cool' is at the centre of a legal fight

You walk into a shop to buy a bottle of oil, spot a familiar red bottle with "thanda" on it, and pick it up. Except... it isn't the brand you thought it was. That's at the heart of the legal battle between Navratna Tel and Dabur's Thanda Tel. Here's why the Delhi High Court stepped in, and how trademark law protects not just brand names, but the way products look too.