Optical Brightener CBS-X (also known as Tinopol or Fluorescent Whitening Agent CBS-X) is a high-performance optical brightener in white to light yellow powder form. It is widely used in detergent formulations, textiles, and paper industries to enhance whiteness and brightness by absorbing invisible UV light and emitting visible blue light. CBS-X is especially valued in laundry detergents due to its excellent solubility in water, high stability over a wide pH range, and superior brightening effect even at low concentrations.