Blue acids, also known as azo dyes, are a type of synthetic organic dye that are used in a variety of industries including textiles, cosmetics, and food. They are often added to products to give them a bright and vibrant blue color. Synonyms for blue acids include acid blue, azo blue, and basic blue. While these dyes are widely used, there are concerns about their safety and potential toxicity, particularly in the food industry where they have been linked to adverse health effects. As such, many companies are now exploring natural alternatives to synthetic dyes to create a safer and healthier environment for consumers.