Finish the film-developing process with an immaculate negative by using this 250mL bottle of Flic Film Slick-200 Wetting Agent for the final rinse of both color and black and white negatives. Slick-200 Wetting Agent decreases the surface tension of the water so that it flows off evenly from the negative surface, preventing the water marks and streaks that would otherwise be produced during drying. Just 5mL of Slick-200 is required to make a liter of wetting agent, which can last up to six months once made, and one 250 ml bottle of Slick-200 can make up to 50 liters of wetting agent.