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Ever noticed that small, colored square at the bottom seam of your toothpaste tube? It’s not just a printing mark—it’s actually a sophisticated color-coding system used in manufacturing.
What the Colors Mean
These squares, known as “color marks” or “eye marks” in the packaging industry, indicate which layer of materials was used during the tube’s production:
- Black: The tube contains only synthetic ingredients
- Red/Pink: A combination of natural and synthetic ingredients
- Blue: Natural ingredients with medication
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