Technology based on ink-jet printers is putting extra frosting onto the supermarket bakery's special-order decorated-cake business. The patented system uses a regular garden-variety computer and a scanner to reproduce color photos on the tops of cakes -- hence the end product's name of "portrait" or "picture" cake. A color monitor lends a touch of theater. But what performs the actual grunt work is a decorating cartridge that sprays atomized droplets of edible food coloring onto any ...

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