Shelf life indicator

作者: Fred R. Youngren

DOI:

关键词:

摘要: An indicator attached to perishable goods show the remaining useful life are described. The preferred embodiment described includes a material, as for example mineral jelly, which is in contact with wick, such paper strip, that jelly diffuses into accordance changes ambient temperature over period of time. amount diffusion indicated by an apparent change color and analogous characteristic goods.

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