decolourise (verb)

1. During the American Civil War, soldiers often decolourised their uniforms to better blend in with their surroundings and avoid being spotted by the enemy.

2. In the 1960s, one popular trend among rebellious youth was to decolourise their clothes, giving them a worn-out and vintage look.

3. Certain religious ceremonies require the participants to decolourise their clothing as a symbol of purity and devotion.

4. The eerie painting in the old haunted house seemed to decolourise all who gazed upon it, draining the life and vitality from their faces.