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Pop can with the special pull-tabs which have polyurethane stress color-changing synthetic leather (PSCSL) inside can be helpful to ensure people being aware of the inner air-pressure. The color is red and will gradually turn into black as the inner air-pressure rising, with which people can easily avoid getting in the trouble of being splashed when openning the pull-tabs of carbonated drink. The design can be widely used on every type of carbonated drink or beer package.
Jing Sun， Chaoyi Zhang， Hao Wang