Decorative Concrete - Internal Stains
About Acid Stain
Acid Stained floors are growing in popularity. Many people are looking to stained floors as an alternative to carpet, tile and wood. The information below is an introduction to Acid Stained floors.
Acid Stains are not a paint or coating or a sealer. Acid Stained Concrete is a coloring process involving a chemical reaction on a cementitious material. A solution made with water, acid and inorganic salts reacts with minerals already present in the concrete (All concrete has calcium hydroxide as a biproduct. This is slaked limed. This picks up carbon dioxide from the air and becomes calcium bicarbonate. This is effluorescence. These are the chemicals that the stain reacts with). Acid stains are made from hydrochloric acid, wetting agents and metallic ions. When this solution is placed on concrete it colors the concrete by chemically combining the metallic ions with the particles in the concrete to form oxides; the result of this reaction is color. Chemical stains can be applied to new or old, plain or colored concrete surfaces. Although they are often called acid stains, acid is not the ingredient that colors the concrete. Metallic salts in an acidic, water-based solution react with hydrated lime (calcium hydroxide) in hardened concrete to yield insoluble, colored compounds that become a permanent part of the concrete. There are many manufactures of Acid Stain and most produce stain in 8 colors that are variations of three basic color groups: black, brown, and blue-green.
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