BWF-303 Formaldehyde-Free Color Fixing Agent BWF-303 is a formaldehyde-free cationic polymer color fixing agent for textile aftertreatment. It contains 50 ± 0.5% solids and is suitable for reactive, direct, sulphur, indigo and other anionic dye systems, with a recommended fixation temperature of 20-40 °C. Product overview BWF-303 is used after dyeing and washing to improve color fixation, particularly in reactive dye applications. The product is a light yellow to reddish