You may have noticed small colored circles or squares on food packaging called “printer’s color blocks” or “process control patches.” These marks, usually in cyan, magenta, yellow, and black (CMYK), are crucial for quality control in printing.printing.

**What They Do:**

Ensure color accuracy and consistency across packages
* Help detect printing issues like color errors or misalignment
* Verify all required colors are applied correctly

During printing, these blocks are checked to confirm colors match, align properly, and have the right ink density. This helps maintain brand integrity, regulatory compliance, and production efficiency.