| 摘要 |
The pocket (20) has an indicator element (30) i.e. tissue piece, placed inside the pocket, where the pocket protects the indicator element from external products. The indicator element is covered with an opaque film (21), so that the element is isolated from light. The element possesses property e.g. color, impermeability and fluorescence, obviously degraded with respect to the property of rest of a fabric (10) during insertion of the element in the pocket. The element is subjected to wash at preset washing temperature prior to the insertion of the element into the pocket. The indicator and the fabric are made of same material. |
