Aniline dyes are synthetic dyes derived from aniline, a compound made from coal tar. These dyes are known for their vibrant colors and are used in various applications, including textiles, paper, and leather. Aniline dyes can produce a wide range of shades, making them popular in the dyeing industry. The discovery of aniline dyes in the mid-19th century marked a significant advancement in color chemistry. Unlike natural dyes, which are sourced from plants and animals, aniline dyes are more consistent and easier to produce. However, some aniline dyes can be toxic, leading to safety concerns in their use.