How does crystal violet enhance the visualization of bacterial structure (s) ?

The crystal violet molecules are trapped in the peptidoglycan layer of bacteria. For Gram-positive with a large peptidoglycan layer, the crystal violet molecules don't get washed off easily by the ethyl alcohol decolorizer (as it does in gram-negative bacteria) after staining. This makes it is possible to view the structure of the gram-positive bacteria after gram staining.