Researchers from the University of Michigan have created self erasable memory that can be used to prevent counterfeit electronics or to alert goods that have been transferred in transit. The new material used in the chip can temporarily store energy and change the color of the light it emits. After a few days, the memory is self erasing and can be erased with a blue light whenever needed. < / P > < p > Parag diotary, a researcher on the project, points out that detecting whether devices have been tampered with is challenging because they can function properly, but may send messages to third parties. If someone opens the device installation or other items, the owner can be informed by a self erasing barcode printed on the chip inside the device. Similar barcodes can be placed on integrated circuit chips or circuit boards to prove that the device has not been opened or internal components have not been replaced. The bar code can be written into the device as a hardware simulation of the software authorization key. Scientists made the self erasing chip by stacking a three atom thick semiconductor layer on top of an azobenzene based molecular film. Azobenzene is a molecule that contracts under ultraviolet light. < / P > < p > this contraction causes molecules to pull the semiconductor, which in turn emits light with a slightly longer wavelength. To read the information printed on a chip, someone needs to look at it with the right light. A researcher involved in the project was interested in the breakthrough because it could be used as a self-cleaning invisible ink for sending secret messages. < / P > < p > stretched azobenzene can naturally release its stored energy in the dark for about a week, and exposure to heat or light can shorten the time. This time span can be extended if stored in a cold, dark place. Global Tech