Computers capable of copying 17 discs at a time and high quality printing equipment for artwork were also seized.

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Which has prompted a handful of firms to try and marry the economics of electronic publishing with the quality of printing.

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When you or I or anybody can self-publish with equivalent-quality paper and printing and distribute through Amazon, what, exactly, does a professional publisher offer?

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The NPD insisted the use of Number 25 was pure chance and that the quality of the printing was unclear, meaning it could be another number.

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As for the crudities of hot-metal typesetting and letter-press printing, all these have long been superseded by electronic setting (in which a 1970s managing director, Ian Trafford, was a pioneer, and made The Economist one too), and by the stunning quality of modern offset printing.

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He said stores should check the quality of the paper and printing, as well as the metallic security thread and watermark.

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Dye sublimation is a printing technology that uses layers of transparent color dye, special dye-receptive paper and a heated printing head to create images that are pretty close in quality to conventional photographic film and paper--up to 16.7 million colors and 403 dots per inch by 403 dots per inch.

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As researchers, they were inspired by the promise of 3D printing technology but frustrated by the price tag and complexity of truly high-quality machines.

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Other possible applications include printing airline and concert tickets, marketing materials from online services, and photos from devices to high-quality industrial printers.

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