What is a characteristic of hydrophilic particles in water treatment?

Hydrophilic particles are characterized by their affinity for water, meaning they interact favorably with water molecules. This property allows them to disperse in aqueous environments effectively.

The correct choice highlights that hydrophilic particles can contribute to increasing water color, often due to the presence of organic materials or suspended solids that absorb or scatter light. These particles can impart a visible color to the water, which can be crucial in water treatment as it may indicate the presence of organic matter, pathogens, or other contaminants.

The other options describe characteristics that do not align with the nature of hydrophilic particles. For instance, a tendency to repel water contradicts the very definition of hydrophilicity, while holding no charge overlooks the fact that many hydrophilic substances can bear charges that influence their behavior in water. Lastly, stating that hydrophilic particles are completely insoluble opposes the principle that these particles typically dissolve to some extent in water, aiding in their interactions.