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Oba 140 Optical Brightening Agent Ws. Versatile Application: Suitable for H-PVC, S-PVC, wool, silk, polyamide, acrylic fibers, and detergents. Excellent Solubility: Soluble in ethanol but insoluble in water, ensuring good compatibility. Superior Whiteness: Multipurpose brightener delivering excellent whiteness for various materials. Environmental Compliance: Product meets environmental protection standards and is a common laser dyestuff.