| 摘要 |
<p>A marking element for indicating whether a pre-defined temperature condition has been maintained. The marking element (1) comprises a first material (8) capable of flowing above a pre-determined temperature separated from a second absorbent material (6) by a barrier layer (7). The first and second materials are such that when the barrier layer (7) is punctured and the pre-determined temperature is exceeded the first material (8) flows along the second material (6) to produce a detectable change.</p> |
