The color white denotes purity.

Explanation:
White is often associated with purity and cleanliness. This association is rooted in cultural and symbolic meanings that have been developed over time. Here are some reasons why white is considered the color of purity:

1. Cultural and Historical Significance:
- In many cultures, white is regarded as a symbol of innocence, purity, and perfection. It is often associated with religious rituals and ceremonies.
- In many weddings, the bride traditionally wears a white dress, symbolizing purity and the beginning of a new chapter in life.
- In some cultures, white is also associated with mourning and is worn as a symbol of purity and reverence for the deceased.

2. Visual Perception:
- White is often seen as a clean and pristine color because it reflects all visible light and does not absorb any color.
- When something is white, it appears to be free from any impurities or contamination, thus giving the visual impression of purity.

3. Symbolism in Literature and Art:
- In literature and art, white is frequently used to represent purity and innocence. For example, white doves are often used as symbols of peace and purity.
- Artists often use white as a background color to create a sense of purity and simplicity in their works.

4. Scientific and Medical Associations:
- In the medical field, white is associated with cleanliness and sterility. Doctors and healthcare professionals often wear white coats to signify purity and professionalism.
- White is also commonly used in the packaging of pharmaceutical products to convey the idea of purity and safety.

In conclusion, the color white is commonly associated with purity due to its cultural, historical, visual, and symbolic significance. It represents innocence, cleanliness, and perfection in various contexts, making it the color that denotes purity.