Recommonded for coloring ready-mix concrete and other masonry products including concrete blocks, pavent and bricks. Available in 10 and 25 pound disintegrating bags. Approximate mix ratios: 1 or 2 lbs of Ironoxx per 94 pound bag of cement for light shades - 2 to 4 lbs of Ironoxx per 94 pound bag of cement for medium shades - 5 or more pounds Ironoxx per 94 pounds of cement for darker shades. Using grey concrete will result in buff or softer color. Using white cement will result in brighter color. To ensure consistent color, keep all variables the same from batch to batch. Variations in the mix design, mixing time and curing conditiosn will affect the final color.