Natina Concrete Solution reacted with the minerals found naturally concrete. The gray concrete turned into a rustic, earthly brown for color that lasts. Our product is more than a stain, pigment or integral concrete since we use no harsh chemicals. The concrete formliner walls in Orange, CA blended nicely into the surrounding background. Change the way you see construction with a range of natural browns. All our solutions are natural, environmentally safe and non-toxic.