RediRipe strip. Somewhat reminiscent of the
that tell you when
to eat food from your fridge, the RediRipe strip tells you how fresh the produce in the supermarket is. How does it know? No squeezing, knocking, or injecting is involved: it simply changes color depending on the amount of ethylene gas—a byproduct of the ripening process—given off, turning from white to blue. The bluer the sticker, the riper the fruit.
Perhaps this can aid me in my constant battle to get bananas that are just slightly short of ripe. Expect to see them in grocery stores in a couple of years.
SCI FI Tech