Optical Brighteners Market by Type of Product (Benzoxazole-based, Coumarin-based, Naphthalene-based, and Stilbene-based), Form (Liquid and Powder), Application (Coatings & Inks, Detergents & Soaps, Paper & Pulp, Personal Care, Plastics, and Textiles), Geographical Regions (North America, Europe, Asia-Pacific, Latin America, and Middle East and Africa), and Key Players - Trends and Forecasts 2026-2040