| 摘要 |
<p>An article which in use is heated to an elevated temperature comprises a thermochromic composition, which when heated to a transition temperature, provides a visible colour change in less than 5 seconds. The transition temperature is at least 30 DEG C greater than the maximum temperature to which the article is heated in use. To place visible indicia on the article, portions of the surface of the article corresponding to the indicia are heated to a temperature at least as great as the transition temperature.</p> |
