Figure 5. The visual picture shows optically similar results whereas the thermogram reveals differences in heat of solution

From

Can You See the Heat? – Using a Thermal Imaging Camera in the Chemistry Classroom

Claudia Bohrmann-Linde, Simon Kleefeld

World Journal of Chemical Education. 2019, 7(2), 179-184 doi:10.12691/wjce-7-2-18