Concentrated Mortar Colors. Interstar Mortar Colors are pure iron oxide mineral pigments designed to be used with all cementitious materials, including Type N, S, M or O strength masonry cement or Portland cement and lime mixtures. The pre measured units of Interstar Mortar Colors provide uniform color control with the flexibility of utilizing local masonry and/or Portland and lime cements to achieve the proper strength and mix design for brick, block stone unit construction. Interstar Mortar Colors are certified ASTM C979 for integral coloring. Size: 3 lb bag.
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