INDICATOR LABEL Russian patent published in 2011 - IPC G09F3/00 G04F1/00 

FIELD: food industry.

SUBSTANCE: indicator label contains a base with inscriptions and/or marks applied on the face surface and an additional translucent outer coating. The base has a film with a concealed warning inscription with in a slow developer.

EFFECT: device is for the first time intended for visual evaluation of a product usability without opening the package with a possibility to compare the proposed indicator label reading to the storage life of the product thus labelled and identification of products whose shelf life has expired.

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