Submission + - Gel changing color in a second
Roland Piquepaille writes: "MIT researchers have developed gels which can change colors almost instantaneously when they're exposed to a variety of stimuli, such as temperature, pressure or humidity. These gels could be used to design inexpensive sensors. For example, these gel-based sensors could be useful in a food processing plant to 'indicate whether food that must remain dry has been overly exposed to humidity.' Now the researchers are working on a gel which would change color in response of electricity. Read more for additional references and a picture of these colorful polymers."