The vibrant and diverse world of hair color relies on a sophisticated understanding of chemical interactions and ingredient properties. HC Blue No. 11, a compound with the chemical identity of 2-[N-(2-hydroxyethyl)-4-(2-methoxyethylamino)-3-nitroanilino]ethanol and identified by CAS number 23920-15-2, is a key player in this field, acting as a crucial intermediate in the creation of various hair dyes.

The molecular formula C13H21N3O5 and a molecular weight of 299.32300 are fundamental to understanding HC Blue No. 11's behavior in chemical formulations. Its physical properties are equally important for practical application. For instance, its appearance as a dark brown powder provides a visual reference, while its density of 1.323 and boiling point of 538.371°C are critical parameters for process engineering and safe handling. The purity level, mandated at ≥99.0% by HPLC, ensures that the colorant functions reliably without introducing unwanted impurities that could affect the final hair color or its safety.

HC Blue No. 11's primary role is as a hair dye intermediate, contributing to the color profiles of both semi-permanent and permanent hair coloring products. Its efficacy is supported by controlled physical characteristics, such as its loss on drying (≤1.0%), which indicates minimal moisture content, and its ash level (≤1.0%), reflecting its inorganic impurity levels. Adherence to these specifications, as provided by reputable manufacturers like Ningbo Inno Pharmchem Co., Ltd., guarantees that the ingredient will perform as expected in complex cosmetic formulations.

Beyond its primary function, understanding ancillary properties like its flash point (279.397°C) is vital for safety assessments during manufacturing and storage. The specified iron content (≤100ppm) further underlines the attention to detail in producing a high-quality chemical for cosmetic use. By meticulously managing these chemical and physical properties, the industry ensures that ingredients like HC Blue No. 11 contribute to safe, effective, and innovative hair coloring solutions.