Boric acid is a very weak acid with the formula H3BO3. Boric acid aka boracic acid or arthoboric acid frequently used as a mild antiseptic in the medical field. As a chemical compound, Boric acid acts as a tribasic acid. However, because it dissociates to such a small extent, it is a very weak acid that is actually used in water solution as an eye wash. Pure boric acid is a colorless, odorless, white powder or transparent crystals with a slightly oily feeling that slowly decomposes with heat at about 340°F (171°C).