Indigotindisulfonic

Indigotindisulfonic acid, also known as indigotindisulfonate or E132, is a synthetic blue dye. It is a water-soluble derivative of indigo, a naturally occurring dye. Chemically, it is a disodium salt of indigotindisulfonic acid. It is produced by the sulfonation of indigo. This process adds sulfonic acid groups to the indigo molecule, increasing its solubility in water.

Indigotindisulfonic acid is widely used as a food coloring agent. It imparts a deep blue hue to various food products, including confectionery, beverages, dairy products, and baked goods. Its E number is E132. The dye is also used in some pharmaceuticals and cosmetics, often to color pills or creams. Its stability under various conditions, including heat and light, makes it a versatile coloring agent.

The safety of indigotindisulfonic acid has been evaluated by regulatory bodies worldwide. In Europe, it is approved for use as a food additive. Similarly, the U.S. Food and Drug Administration (FDA) permits its use in certain food applications. However, like many food additives, it can cause allergic reactions in a small percentage of the population, particularly those with asthma or aspirin sensitivity. These reactions are generally mild. The acceptable daily intake (ADI) for indigotindisulfonic acid has been established to ensure its safe consumption.