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The stamp is permanent. The dye is only permanent if they put the dye in the concrete in the mixing truck. If they ad stain to the surface it wears off. You can have both dyed and stamped concrete. The disadvantage of stamped in my climate (Ohio) is that the surface holds water. The pockets of water freeze in the winter and thaw more slowly than water on a smooth surface. More insidious is if it's done poorly and the stamping is too deep water sits in it in the summer and grows mold, which is as slippery as ice when it gets wet.
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