Section 1 1. Introduction on Sensors to Measure Food Safety and Quality 2. Fundamental of Colorimetric Sensors (definition, principles, and mechanism) 3. Recent Advances in Colorimetric Sensors: Design, Fabrication, and Characterization 4. Global Trends of Application of Colorimetric Sensors in Monitoring Food Freshness: A Scientometric Analysis 5. Sensing Materials: Natural Pigments and Synthetic Chemo-Responsive Dyes Section 2 6. Progress in Food Authentication by the Application of Colorimetric Sensor and Chemometrics 7. Colorimetric Sensors for Ensuring the Quality of Liquid and Semi-Liquid Foods 8. Colorimetric Sensors for Poultry and Red Meat quality control 9. Applications of Colorimetric Sensors in Cereal and Cereal-Based Foods Analysis 10. Colorimetric Sensors: Sensitivity and Detection Limit 11. The Potential Use of Colorimetric Labels for Measuring Seafood/ Aquatic Products in China -An Overview 12. The Potential Use of Colorimetric Labels for Measuring freshness of Seafood/ Aquatic Products in China -An Overview Section 3 13. Colorimetric Sensors Safety, Quality Controls, and Regulatory aspects 14. Challenges, Commercialization, and Future Industrial Application of Colorimetric Sensors/Colorimetric Labels