According to an accepted doctrine, the structure of a dye determines the colour of its solution if the solvent itself is colourless. The experiments from this video show the contrary and the protagonists explain this phenomenon.

Video produced by Beilstein.TV in cooperation with the Wuppertaler Chemiedidaktik. Video licensed under the Creative Commons Licence 4.0 - By, No Derivatives (CC BY-ND 4.0).