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Indicator for packaging of such as milk is built into opening seal has a chemical that responds to moisture and changes colour over period of days
Indicator for packaging of such as milk is built into opening seal has a chemical that responds to moisture and changes colour over period of days
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机译:诸如牛奶包装的指示器内置于开口密封中,其化学成分可对水分产生反应并在几天内变色
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摘要
The carton used to hold such as milk has an insert [2] set into the opening seal [1]. The insert is covered by a peel off foil [4] and contains a chemical [3] that acts as a moisture indicator. When the foil is removed the colour of the insert changes from dark blue to light blue over a period of days to indicate freshness.
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