An anonymous reader writes: The researchers at MIT have created a new structured gel that can rapidly change color in response to a variety of stimuli, including temperature, pressure, salt concentration and humidity. Apparently the structured gel can be used as a fast and inexpensive chemical sensor, says Edwin Thomas, a professor of materials Science and engineering at MIT. The gel will be most useful in a food processing plant, where the sensor will be able to indicate whether food that must remain dry has been overly exposed to humidity.
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