The present invention relates to a reactive printing dye composition, which includes: at least one reactive dye; an organic buffer; and a mirabilite or a dispersant. Warm production brine is cooled at the surface using a heat exchanger as a crystallizer to precipitate the mineral in the exchanger and form a slurry. The hinge includes at least one linear groove configured in the plastic film to reduce the predetermined thickness of the plastic film at the linear groove.