Color Hardener is a powdered mix that is broadcasted onto fresh concrete after the bleed water has evaporated. This product is then bull floated into the top of the concrete. It colors just the top of the concrete. It is considered a primary form of color.
Powdered Release agents are a powdered mix of hydrophobic powder and concrete color. This product is broadcasted onto the surface of the concrete before stamping. It has a dual purpose, it keeps the stamps from sticking, while also adding additional secondary color to the concrete.
Acid stains are a acid based chemical compound that reacts with the lyme in the cement paste on your concrete. Acid stains can be used for new or old concrete. Acid stains are best when used with a high quality sealer to protect the stain.