The acid dyes are a more eco-friendly option because they are made from natural ingredients with no harmful side effects. There are a type of dye that is created by the reaction of an acid with a metal. This process can be used to create a wide variety of colors and shades.

The most common acid used to make these dyes is nitric acid or sulfuric acid. The color of the dye will depend on the type of metal salt it is mixed with. The different metal salts produce different colors when mixed with an acidic solution like nitric or sulfuric acids. For example, ferrous sulfate produces dark green and cobalt chloride produces blue. Acid dyes are used in many industries including the textile industry, cosmetics industry and food industry.

Molecularly split acid dyes.

Aggregated split acid dyes.