1. It has the functions of complexation, anti-oxidation and potential regulation, and is a multifunctional additive for oxidation and coloring. 

2. With unique components of dispersant and brightener, it makes the properties of the tank solution stable, has excellent dispersibility and reproducibility, enables uniform oxidation and coloring, and results in a shiny and bright film layer. 

3. The base color can be adjusted according to the requirements of customers. Its uniformity is better than that of single nickel salt, and it is easier to obtain a black color compared with single nickel salt.