Decolour is a term used to describe the fading or loss of color from a material or surface. Synonyms for this term include bleach, fade, discolor, whiten, pale, and blanch. Bleach denotes the use of chemicals to remove or lighten color, while fade implies a gradual loss of color over time. Discolor is a more general term that refers to any change in color, while whiten and pale denote the loss of brightness or intensity in color. Blanch usually refers to a sudden or drastic loss of color, often due to shock or fear. Overall, decolour and its synonyms are useful for describing a wide range of color loss or fading.