| 摘要 |
A disc or other insert placed on the neck of a container provides a visible indication that the lid of the container had been removed or tampered with. An indicator is provided on the disc surfaces and it changes its character to provide its indication upon removal of the lid. For example, the indicator might be microencapsulated, and the microcapsules would be broken upon separation of the discs. Means in the lid rub the indicator for activating it. In a variant of this, the lid is transparent and permits viewing of the indicator through the lid. The disc may have a layer under the indicator for compensating for manufacturing tolerances.
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