The color of sodium hydroxide (NaOH) solution depends on its concentration and impurities. In general, dilute sodium hydroxide solutions are colorless. As the concentration increases, the solution may appear light blue or greenish due to the presence of dissolved sodium ions (Na+). Highly concentrated sodium hydroxide solutions can sometimes have a yellow tint due to the absorption of impurities, such as iron compounds. However, it's essential to note that the typical color of commercial sodium hydroxide solutions can vary depending on the manufacturer and the grade of the product.