| 摘要 |
<p>A composition having regulated occurrence of opacity and clarity at selected temperatures; method of making and using such a composition to create a temperature-indicating device by filling the composition in a suitable container of transparent material and having a background in the form of a colour, a letter or a number i.e., in order to be able to visually interpret the difference between opacity and clarity. A reversible indicating device is made which can show if the upper or lower limits of a pre-set temperature interval has been exceeded or fallen below. </p> |
