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Gilt Taste, the company’s food platform, is to release a free iPad-only app, also called Gilt Taste, on Wednesday. Its 140 recipes are presented straightforwardly — all text, one recipe step on each page, no videos — except for one game-changing feature. Using the iPad’s built-in camera, which tracks your hand movements, you can turn the pages of the recipe without touching the tablet. Lift your hand in front of the screen, brush it from right to left (as if turning the page of a book), and the screen flips to the next step. Wave your hand from left to right, and it goes back to the last step.