| 摘要 |
1492377 Package integrity indicator BIOMEDICAL SCIENCES Inc 21 Nov 1974 [23 Nov 1973] 50485/74 Heading G1B A sealed package has visual integrity indicator isolated from the external atmosphere but in communication with an artificial acidic or basic atmosphere within the sealed package, the sensor being visible from outside and including a pH sensitive dye which changes colour if the integrity of the package is broken. The artificial atmosphere may be e.g. CO 2 or NH 3 . The package may be transparent, the sensor comprising indicia printed on the inside thereof. The dye system may include a buffer. |
