SODIUM SULPHIDE FLAKES 1)red flakes Na2S:60% Min. Water insolubles:0.4% Max. Fe:1500ppm Max. Na2CO3:5% Max Packing:25kg per bag 2)yellow flakes Yellow Sodium Sulphide Flakes Na2S:60% Min. Water insolubles:0.4% Max. Fe:150ppm Max. Na2CO3:5% Max Packing:25kg per bag