BonWay 32-373 Ironoxx Integral Concrete Pigment, 722 Black Ironoxx, 10-Pound Bag Ratio: 1 lb for 94 lb cement for light grey, 3 lb for 94 lb medium grey, 5 lb for 94 lb for dark grey, 7 lb for 94 lb for jet black 10-pound bag Disintegrating bags can be added directly to concrete Always perform a sample batch to confirm acceptability to the color result See www.bonway.com for more information