QR code interpreters don’t care if a pixel is white, black, red, orange, or maroon – only contrast matters. Since the blue in Big Blue is fairly dark, it registers as a dark pixel.

A Chinese subway system’s attempt to spread some Lunar New Year cheer backfired over the weekend, as panicked passengers mistook seasonal red QR codes for positive Covid tests. Chinese social ...

You can change your QR code color to green, red, ... For example, you can set up QR codes on pamphlets or brochures, enabling guests and potential donors to read about your nonprofit organization.

The smartphone has taken the old-fashioned barcode to a new level. You may have seen them, even if you didn't know what they were. These new "quick response codes" look more like weird postage ...

For the past two years, a red QR code in China has meant that you have — or are suspected to have — Covid-19. “When I saw it this morning, I thought my health code turned red,” one user ...