The vibrant world of hair color is a testament to the power of applied chemistry. At the molecular level, achieving specific shades and ensuring longevity involves intricate chemical reactions powered by key ingredients. One such foundational component is 4-amino-3-nitrophenol hydrochloride. Understanding its chemical nature is essential for anyone involved in the development and production of hair coloring products.

Chemically known as 2-[4-amino-N-(2-hydroxyethyl)-3-nitroanilino]ethanol, hydrochloride, and identified by CAS No. 94158-13-1, this compound is a significant player in the color cosmetics arena. Its molecular formula, C10H16ClN3O4, details its precise atomic composition. Typically presented as a yellow crystalline powder, its physical state and high purity (≥99.0% HPLC) are crucial for its predictable performance in complex formulations. The high boiling point (515.9°C) and flash point (265.8°C) also indicate its relative stability under standard processing conditions.

The primary function of 4-amino-3-nitrophenol hydrochloride is as an intermediate in the synthesis of hair dyes. It acts as a toner, contributing to the final color by undergoing oxidative coupling reactions. This characteristic makes it a valuable component in both permanent and semi-permanent hair color systems. Its application is not limited to hair; it can also serve as an intermediate for organic dyes used in other industries, demonstrating its versatility.

When manufacturers consider their supply chain, they often look to buy 4-amino-3-nitrophenol hydrochloride from trusted manufacturers. The competitive price of 4-amino-3-nitrophenol hydrochloride is a factor, but it must be balanced with quality assurance. Reputable suppliers of hair dye intermediates, such as NINGBO INNO PHARMCHEM CO.,LTD., provide materials that meet strict specifications, ensuring that the resulting hair dyes are both effective and safe.

The safety of cosmetic ingredients is rigorously evaluated. Scientific studies and expert panels have assessed amino nitrophenol dyes, including this compound, finding them generally safe for use in hair dyes when applied according to standard practices and at recommended concentrations. This includes understanding potential skin sensitization, which is managed through proper product formulation and consumer guidance. Adhering to hair dye safety in the EU and other regulatory frameworks is paramount.

In summary, 4-amino-3-nitrophenol hydrochloride is more than just a chemical name; it's a key ingredient that enables the creation of beautiful and diverse hair colors. Its specific properties, combined with careful sourcing and adherence to safety standards, highlight the complex chemistry that underpins the cosmetic industry's ability to deliver vibrant and reliable hair coloring solutions.