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SolarFast Wash is a high-strength, concentrated scour/detergent used to remove undeveloped SolarFast dye after exposure to UV light. It is highly effective for preventing back staining during washing. This is especially important for preserving highlights and white areas when making photographic SolarFast prints. Works even better than Synthrapol because it is very cationic, and has a magnetic attraction to the dye molecules, keeping them away from the fabric. 4oz bottle.