| abstract |
The invention relates to a covering cap (10) for detecting and administering substances. According to the invention, an indicator (11) is deposited on the surface of at least one wall of the covering cap (10) and/or embedded in the wall material in such a way that a substance (20) to be indicated travels from outside the cap (10) to the indicator (11); said indicator (11) is different from the material or material combination forming the cap (10), is sensitive to the substance (20) to be indicated, and permanently or temporarily changes its state from an initial state in the presence of the substance (20). |