Which innovative 'smart packaging' technology is being used by major food brands to indicate optimal freshness of perishable foods like meat and dairy without opening the package?

The food industry is embracing smart packaging technologies to enhance consumer experience, extend shelf life, and provide valuable information. These innovations include everything from QR codes linking to origin stories, to temperature-sensitive indicators that show freshness, to NFC chips enabling interactive experiences. How well do you know the cutting-edge developments in food packaging technology that are transforming how we interact with our food products?

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Thermochromic ink indicators that change color based on time-temperature exposure
Blockchain-encoded QR codes that update expiration dates in real-time
Voice-activated packaging that announces remaining shelf life when prompted
Micro-perforation technology that automatically releases preservative gases as needed