Good news! Progress in the 21st century!
"The sensor’s microneedles are molded from a solution of edible proteins found in silk cocoons, and are designed to draw fluid into the back of the sensor, which is printed with two types of specialized ink. One of these “bioinks” changes color when in contact with fluid of a certain pH range, indicating that the food has spoiled; the other turns color when it senses contaminating bacteria such as pathogenic E. coli."
Velcro-like food sensor detects spoilage and contamination | MIT News | Massachusetts Institute of Technology Color-changing array of silk microneedles could help stem outbreaks and avoid food waste.
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