# Inkjet-printed pH-sensitive QR code labels for real-time food freshness monitoring

> Research article (Journal of Materials Science, 2021) · cited 36× · AI/ML

**Wikidata**: [openalex:W3198892064](https://www.wikidata.org/wiki/openalex:W3198892064)  
**Source**: https://4ort.xyz/entity/inkjet-printed-ph-sensitive-qr-code-labels-for-real-time-food-freshness-monitoring