Boric Acid, a crystalline chemical compound of boron, oxygen, and hydrogen: it is also known as boracic acid and orthoboric acid. The compound is a relatively weak acid. Boric acid is soluble in alcohol and in boiling water. When boric acid crystallizes from water solutions, it forms into thin plates. Boric acid does not melt when heated; instead, it decomposes into water and a compound called metaboric acid.

Most boric acid is produced by adding a strong acid such as sulfuric acid to a solution of borax and water. The mixture is then cooled until the boric acid crystallizes. Boric acid is used in making enamels, ceramic glazes, heat-resistant glass, and various boron compounds. It is also used as a fire retardant in cotton fabrics and in insulation made from cellulose. Dilute solutions of boric acid are sometimes used as a mild antiseptic for the skin or eye.

Chemical formula: H3BO3.