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Thermocouple sheet consisting of a thin layer of liquid crystals that was printed on a black background. Liquid crystals are organic chemical products which expand or tense themselves.
When you place your hand on this black plastic square, you create a thermal mould; each colour represents a different temperature.
This product is often used in educational environments. The colour changes depending on temperature changing allowing students to visually connect with what is happening with the aim to create a colourful and compelling learning experience.
There are many possibilities to use, but as shown in the image this sheet can cut to fit on the back of a smartphone.