Unscrupulous shop owners trying to sell food that is past its best could be undone by a new design of packaging.

Proposed by Japanese outfit TO-GENKYO, the Fresh Label visibly changes to indicate how fresh the food is.

It detects the levels of ammonia being emitted by the food. As food ages, ammonia levels increase and the label will change colour to reflect this. It will eventually become so dark that the label's barcode becomes unreadable, preventing it from being sold once it has reached its use-by date.

This is one of the entries for the Good Design Awards. Spoon & Tamago are previewing the awards, picking the best of the entries each week.

不道德的店主试图出售过期的食品，他可以通过一个新设计的包装将其恢复原样。

日本的 TO-GENKYO 机构提出，新鲜标签的明显变化可以指出食品是多么新鲜。

它检测食品放出的氨的水平。随着食品陈放，氨的水平会提高，标签将会改变颜色来反映这种情况。它最终会变得非常黑，使得标签的条码都变得不能读取，防止它在一旦已经达到它的标示日期时被卖出。

这是优秀设计作品奖中的一项。Spoon & Tamago 每周都挑选最好的作品，现在正在预检奖品。