Last November I spent a fascinating few days at HP's printer research labs in San Diego and Boise. I couldn't fit as many details as I wanted about the various testing chambers - variously lined with copper or anechoic cones, subjected to extreme heat, light or humidity, blasted with interference and static or filled with forensic equiment to rival CSI - into my latest piece for FT Digital Business. But I do explain the rice grains and the Arizona road dust...

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