| 摘要 |
A food contamination detector (10). The food contamination detector (10) comprises a first bar code symbol (52) coded to identify a food product by a bar code reader, a second bar code symbol (54) coded to identify contaminated food by a bar code reader, and an indicator (16) printed onto a substrate (20), which changes color when food is contaminated and caused the first bar symbol to be unreadable by a bar code reader and causes the second bar code symbol to become readable by a bar code reader.
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