(of a substance) undergoing a reversible change of colour when heated or cooled.
- ‘Others used materials with thermochromic pigments that change colour at different temperatures.’
- ‘This gives a thermochromic transition temperature of 29°C, which is near ideal for intelligent window coatings.’
- ‘The design is printed in thermochromic ink, so when the stamp is heated - such as by placing a finger on it - the ink changes colour to reveal an ion enclosed within the ‘buckyball’ cage.’
We take a look at several popular, though confusing, punctuation marks.