QR code on a curved or shiny surface
Curves bend the squares and gloss reflects light, and both can stop a phone from reading a code. Many failures on bottles and laminated signs come from these two.
A few placement choices fix most of it.
Does a QR code scan on a curved surface?
It can, if the curve is gentle and the code is small compared with the curve. A tight curve distorts the squares.
- Place the code on the flattest area.
- Use a smaller code on a bottle neck or tag.
Why does gloss cause trouble?
Glossy surfaces reflect lights and cover parts of the code in glare. Use matte finishes, or place it where light does not hit directly.
What about laminated signs?
A matte laminate keeps the code readable. A gloss laminate can create a mirror effect under spotlights.
How do I test it?
Scan the real product under the real lights, from a few angles.
Questions
Can I put a code on a mug?
Yes, on the flattest area, matte if possible.
Does glass work?
Yes if there is no glare.
Can I use a hang tag?
Yes. A flat tag avoids curves.
What about foil?
Foil reflects. Avoid it behind the code.
Does size help?
A larger code tolerates some curve.
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