| 摘要 |
<p num="1"><br/><br/><br/>A lid (2) for a container (67), the lid (2) comprising a first plastic layer <br/>(15) including a portion having at least one coloured pigment and a second <br/>plastic layer (14) including at least one thermochromic substance capable of <br/>becomin translucent upon reaching a predetermined temperature in response to <br/>heat transfer from or to contents of the contain so as to reveal the coloured <br/>pigment of the first layer. Alternatively, there is described a lid comprising <br/>a layer with a portion (62, 63) that becomes either observable or non-<br/>observable at the predetermined temperature.<br/>
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