| 摘要 |
The present invention relates to a discolored sticker by ammonia which is capable of identifying the decomposition of food by using a color change due to the chemical reaction between ammonia which is generated while decomposing the food and an indicator. The present invention comprises: a layer of an adhesive agent; a film layer which is formed by micro processing, wherein the ammonia in the upper part of the layer of an adhesive agent may contact the indicator; an indicator packed layer which is discolored by ammonia gas which is penetrated, and installed in the upper part of the film layer; a transparent film layer which recognizes the color changes of the indicator packed layer with the naked eye by being installed in the outer side of the indicator packed layer. |
