| 摘要 |
The present invention provides a cap for a hermetically sealed container, said cap providing a visually observable indication of elapsed time from the opening of the seal of said container, said cap including means for releasing a chemical which effects a color change in a chamber formed therein, said chamber being provided with a transparent section for viewing the contents thereof and said released chemical effecting a cumulative color change of said section with time, the arrangement being such that manipulation of said cap to open said container and said seal effects activation of said releasing means.
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