| 摘要 |
Tamper- and solvent-indicating labels comprise a single layer of a solvent-indicating composition over and in contact with a tamper-indicating label. The composition of the solvent-indicating label is sensitive to solvent (e.g., water, hydrocarbon, etc.). If the label is designed for sensitivity to water, then it typically comprises an organic solvent-soluble binder, pigment at a concentration greater than the critical pigment-binder ratio, and dispersed water-soluble dye particles. The tamper-indicating label can be of any construction, e.g., frangible and difficult to remove, or easy to remove but leaving behind a pattern of adhesion, or cleanly removed but irreversibly changed.
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