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A manual pen has been developed to detect in minutes the stale food, fruits, vegetables and deadly nerve gas, the nib of which changes color in the presence of these gases.

Especially in wars or attacks, nerve agent gas is used which does not have smell and color. In the same way, many food items emit gas vapors that we cannot smell even when they are spoiled.

The pen has been developed by the Shenzhen Institute of Advanced Studies in China in collaboration with several institutions. The first prototype looks like a syringe and is very low cost and effective. It can also detect very small amounts of harmful chemicals due to its properties.
Such sensors typically use aggregation induced emission fluorescence (LED genes) and emit a kind of pigmented light after the harmful chemicals stick to them, but before that all these systems were based on liquids. Were

Now, Xiao Xiao, Pengfang Zheng, Hyato Feng, Ben Zong Teng and others have solidified the LED genus and put it on the tip of a needle. As soon as a gas is emitted or a food vapor comes out, its tip becomes bright.

Two prototype pans were then made, one of which could detect a toxic gas called de-ethyl chlorophosphate (DCP) and the other an amine sensor. Both can change color in half an hour to show the presence of toxic gas. After further research, the duration of the amine detector sensor has been reduced to five minutes.

It should be noted that even if the fish is slightly old, the amine sensor will identify it immediately. In the next phase, different sensors will be developed to detect different food disorders.