Figure 8. Non-fluorescent educt (left) before and fluorescent product (right) after hydrogenation.

From

Catalysis Revisited An Overview of Classical School Experiments and New Approaches for a Better Conceptual Understanding

Marco Reinmold, Julian Grob, Bastian Hohm, Arnim Lühken

World Journal of Chemical Education. 2023, 11(3), 104-113 doi:10.12691/wjce-11-3-14