ISSUE:

Hello teacher, could you answer this: when a crystal violet solution is acidified, it changes color from violet to blue, then to green and finally to yellow. write equations that describe these color changes.

Hello foreigner.
In the following link:
www.quimicaorganica.org/foro/121-pregunt...violeta-cristal.html
You have the synthesis of crystal violet.

Observe that the structure of the dye has three basic centers (tertiary amines) and each one of them will progressively combine with the acid that is added to it in a certain solvent and we will have the color variation that is observed experimentally. Greetings