New York-based Gourmet Impression has invented two new hand-held tools that allow restaurants, caterers and other food businesses to turn pizzas into edible advertisements. The two products will be debuted at the Northeast Pizza Expo in Atlantic City on 2 and 3 October. Using modular devices called the "Stamper" and the "Roller," companies can emboss their logo or advertising messages on food. Initial prototypes are designed for pizzas, calzones, bread sticks, cheeses, melons, white bread, pitta breads, brownies, pies, butter sticks and baked potatoes, the company said.