Sodium Sulphide yellow flakes from iron content 5ppm-80ppm, contact Ms.Li at 135. ... alkaline solution4.Professional supplierProduct: Supply Sodium Sulphide yellow flakes 10ppm, 30ppm, 50ppm and 80ppm.Property: Thin flakes, yellow or red, soluble water, presenting strong alkaline ... with or without pallets,loading quantity is 22MT/20'FCL Sodium Sulphide yellow flakes 30ppm